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Cutaneous Tuberculosis: Clinicopathologic Arrays and Diagnostic Challenges.

1. Background

Cutaneous tuberculosis is a relatively uncommon, comprising 1-1.5% of all extrapulmonary tuberculosis manifestations, which manifests only in 8.4-13.7% of all tuberculosis cases [1]. Although rare, given its global prevalence, it is imperative for the clinicians to distinguish the many clinical variants of cutaneous tuberculosis and the masquerading infections--granulomatous syphilis, discoid lupus erythematosus, psoriasis, tuberculoid leprosy, sarcoidosis, actinomycosis, mycetoma, bacterial abscesses, and other skin infections--to preclude missed or delayed diagnosis [2, 3]. Most of the diagnostic methods for cutaneous tuberculosis confer lower sensitivity and specificities. Therefore, the physicians must resort to every possible test along with broad clinical consideration; hence the summation of positive rudiments would be auxiliary in precise diagnosis.

2. Epidemiology

Tuberculosis represents a major public health problem in Southeast Asia, since a larger proportion (45%) of total estimated 10.4 million infective cases were listed in the region [4]. Compiling the toll death rate, Southeast Region and African Regions accounted for 85% of total death due to tuberculosis [4]. TB ranks the 6th leading cause of death in Nepal [5]. The prevalence study was not done in Nepal due to impassiveness of government participation in the health sector; however, annually, 34,122 cases of tuberculosis were reported to NTP [6].

Tuberculosis is endemic in Nepal; limited cases of cutaneous tuberculosis were reported, however. The incidence of cutaneous tuberculosis in Central Nepal was reported as 0.1%; nonetheless, the exact incidence is still anonymous over the country. The clinicoepidemiological study done in Nepal by Dwari et al. 2010 revealed tuberculosis verrucous (48%) as predominant clinical type [7]; however, on referencing to earlier studies, Lupus vulgaris was the most common (64%), followed by tuberculosis verrucosa cutis (19%) and papulonecrotic tuberculid (4%) [8]. Ironically, cases of cutaneous multidrug resistant tuberculosis (MDR-TB)--resistant with at least two of the most potent first-line anti-TB medications, isoniazid and rifampicin--and XDR-TB--MDR strains that are resistant to fluoroquinolones plus one of the injectables such as kanamycin, amikacin, and capreomycin--have also been reported from India and China abutting Nepal [9-11]. Nevertheless, the exact epidemiological entity of perchance MDR/XDR cutaneous tuberculosis cases is still unbeknownst or unreported from Nepal.

3. Etiological Agent

The main etiological agent of the Cutaneous tuberculosis is Mycobacterium tuberculosis--occasionally M. bovis or BCG vaccine (an attenuated strain of M. bovis) [12,13].

Mycobacterium tuberculosis is a straight or slightly bent (rod-shaped), nonmotile, nonsporulated, bacillus, being 1 to 10 [micro]m long and 0.2 to 0.6 [micro]m wide; its most important feature is acid-fastness due to high lipid content in the cell wall. Approximately there are 4000 genes with most of them involved in the mechanism of immune system invasion and 200 of them for lipid metabolism; consequently, the pathogen is able to survive both inside and outside the phagocytic cells [14]. Meanwhile, as lipids are the main energy source of Mycobacterium tuberculosis, the pathogen is directly responsible for multiplying in host tissue and forming cellular walls [14,15].

4. Route of Infection

Cutaneous tuberculosis can be acquired from hematogenous or lymphatic dissemination of a pulmonary focus or by direct inoculation. The pivotal factor for the clinical presentations prior to contact with bacilli is the host natural immune response, however.

Exogenous infection occurs with direct inoculation of bacilli into the skin of predisposed individuals (tuberculous chancre, tuberculosis verrucosa cutis) [1].

Endogenous infection is secondary to a preexisting primary focus and may result from contiguous (orificial tuberculosis, scrofuloderma), hematogenous (acute miliary tuberculosis, tuberculous gumma, and lupus vulgaris), or lymphatic dissemination (lupus vulgaris) [2,16].

5. Classifications of Cutaneous Tuberculosis Based on a Load of Pathogens

Based on a load of the pathogens on skin, the tuberculosis variant can be classified into two broad categories.

Multibacillary forms (easily detected in cutaneous tissue) include tuberculous chancre, scrofuloderma, orificial tuberculosis, acute miliary tuberculosis, and tuberculous gumma [17,18].

Paucibacillary forms (bacilli being sparse) include TB verrucosa cutis, tuberculoid, and lupus vulgaris [17,18].

6. Clinical Manifestations of Cutaneous Tuberculosis

Cutaneous tuberculosis exhibits diverse clinical manifestations: inflammatory papules, verrucous plaques, suppurative nodules, chronic ulcers, and other atypical lesions [19].

7. Exogenous Cutaneous Tuberculosis

7.1. Tuberculosis Chancre. The direct inoculations of Mtb in the skin from the traumatic injuries or surgical procedures performed with unsterilized materials and even after tattoos or body piercing lead to acquired tuberculosis chancre. Progressing from a firm, painless, reddish-brown, slow-growing papule, or nodule, after 2 to 4 weeks it develops into the friable ulcers--tendency to bleed with a granular surface [20]. Furthermore, the bacilli disseminate to regional lymph nodes via lymph.

Presumptive identification can be done with histopathological examinations, where the acute neutrophilic inflammatory reaction prolific in AFB and necrotic areas are usually noticed [16]. Sequentially, the lesion acquires a granulomatous form with enlarged giant cells after 3 to 6 weeks with the reduced number of bacilli [20].

7.2. Tuberculosis Verrucosa Cutis. Tuberculosis verrucosa cutis, the usual exogenous form oftuberculosis, is more common in an anatomist, physicians, and bare-footed children of tropical zones, since the infection proceeds with an injured dermal layer [1]. The lesions--solitary, painless, and without adenopathy--are more seen commonly in the extremities prone to traumas [16]. The lesions jerk as erythematous papules to verrucous plaques with peripheral extension.

8. Endogenous Tuberculosis

8.1. Scrofuloderma. Scrofuloderma, also called colliquative cutis, is a common form of cutaneous tuberculosis; it results from direct extension from an underlying tuberculosis lesion in lymph node, bone, joints, or testicles [1, 2]. The neck, axillae, and groin are often involved, with the cervical lymph nodes as a common source of infection [1]. Early lesionsappearasfirm, painless, subcutaneous, andred-brown nodules which advanced to ulcers and discharging sinus [21]. Spontaneous healing may occur, leaving keloid scars, retractions, and the atrophic sequel [21].

8.2. Orificial Tuberculosis. Orificial tuberculosis--a very rare form of cutaneous tuberculosis--is clinically characterized by ulcerations at mucocutaneous orifices including mouth, nose, perianal region, and genitalia and adjacent skin, usually advanced form of lungs, intestinal, or genitourinary tuberculosis [22]. The lesions, about 1 to 3 cm in diameter, appear as friable, painful erythematous-to-yellowish papules and nodules, which may advance to painful ulcers [16]. Edema and inflammation are obvious in perilesional tissue.

8.3. Lupus Vulgaris. Lupusvulgarisisthemostcommon form of cutaneous tuberculosis in Europe, India, and Nepal [8,13, 16]. It is a chronic, progressive, paucibacillary form of cutaneous tuberculosis which occurs primarily in the previously sensitized individual [23, 24]. The infection occurs endogenously via lymphohematogenous route and occasionally via exogenous route--with drainage scar of scrofuloderma [25].

The most typical clinical feature of lupus vulgaris is a papulotubercular lesions commonly on the legs and buttocks, which eventually coalesce into a plaque (Figures 1, 2(a), and 2(b)) [12]. The plaques grow peripherally, with serpiginous or verrucous borders, accompanied by central discoloration and atrophy [25]. Besides, the classic appearance is described as "apple jelly nodules" observed on diascopy [24, 26].

8.4. Tuberculous Gumma. Tuberculous gumma, also known as metastatic tuberculosis abscess, is an outcome of hematogenous dissemination of mycobacteria from primary focus especially in an immunocompromised host, scarcely in an immunocompetent host too [17, 27]. Clinically it may bear a semblance to scrofuloderma; few lesions affecting trunks and extremities with inconsistent subcutaneous nodules having tendency to ulcerate and drain caseous secretion are seen in tuberculous gumma [23].

8.5. Acute Miliary Tuberculosis. It is a rare presentation of cutaneous tuberculosis predominantly in severely immunocompromised host, demonstrating anergy. The bulk of cases have been increasing primarily due to coinfection with HIV with declining CD4 count below 100 cells/[micro]L [28]. Clinically, diverse cutaneous lesions--erythema and erythematouswhitish or erythematous-purplish papules--may be noticed which later on break to form umbilication and crust formation leaving hypochromic scars [17].

9. Tuberculids

Tuberculids are acute or chronic cutaneous forms of tuberculosis, appearing with diverse clinical forms, having a propensity of hyperergic expressions, active TB, or disseminated forms [20]. The discrete relationship between tuberculids and TB continues to be debated because the clinical forms usually have a symmetrical distribution, tuberculous involvement (usually inactive) of viscera or lymph nodes, and the absence of AFB (low positivity to culture and PCR) in the lesions [16,26].

9.1. Papulonecrotic Tuberculids. Papulonecrotic tuberculids are the commonly observed form of cutaneous in children and young people [29]. They appear as painless, symmetrical erythematous, or violaceous papulonodular lesions noted particularly around the face, ears, extensor areas of the trunk, extremities, and buttocks, leaving a depressed scar [26].

9.2. Lichen Scrofulosorum. Lichen scrofulosorum is an eruption of multiple, small, grouped, asymptomatic, firm, perifollicular, lichenoid papules or plaques often affecting children and adults with underlying diseases of bone and lymph nodes [16, 26]. The dermatosis leaves no scar after months or years. The onset of this tuberculid was speculated, after BCG vaccinations and in the patient infected with M. avium-intracellulare [30].

9.3. Erythema Induratum of Bazin. Erythema induratum of Bazin is a granulomatous lobular panniculitis, which appears as erythematous-purplish subcutaneous nodules usually in legs and thighs [26]. The nodules advance few centimeters in diameter forming deep ulcers with caseous discharges and leave pigmented scar without or after successful treatment.

The relapse, however, may occur in flares every 3-4 months with similar clinical presentations [1]. Besides, the tendency of coinfectivity with systemic diseases like sarcoidosis is the differential clinical diagnosis of erythema nodosum [16, 21].

10. Diagnosis of Cutaneous Tuberculosis

10.1. Differential Diagnosis. The precise diagnosis is often significantly deferred and delayed, as cutaneous TB is not routinely considered in the differential diagnosis due to the relative paucity of pathogens in lesions and varied clinical manifestations (Table 1) [2,16,19, 31-33]. Hence, differential diagnosis is obligatory for the successful clinical management and treatment.

10.2. Laboratory Diagnosis

10.2.1. Tuberculin Skin Test. This technique involves an injection of 0.1 ml tuberculin, purified protein derivatives (PPD) derived from the attenuated strain of M. tuberculosis, intradermally, and read after 48 to 72 hours; on positive interpretation, the induration diameter exceeds the measuring of 10mm. The reaction is the classic example of delayed hypersensitivity reaction, where sensitized T-cells by prior infection are recruited thereby releasing the lymphokine [34]. These lymphokines induce indurations through local vasodilation, edema, fibrin deposition, and recruitment of other inflammatory cells to the area [34, 35]. TST has the sensitivity between 33% and 96% and specificity of 62.5% with cutoff 10mm for cutaneous tuberculosis; the sensitivity, however, exceeds 97% in an unvaccinated population [36,37].

Furthermore, on analyzing clinical forms of cutaneous tuberculosis separately, positivity, intensity of the tuberculin skin test also diverges (Table 2). Conclusively, neither a positive TST necessarily indicates active infection nor a negative TST rules out the infection persistence.

10.2.2. Immunological Tests (Interferon Gamma-Release-Assay). The FDA approved immunological tests, QuantiFERON and EliSpot, assess sensitizations to M. tuberculosis by measuring the amount of INF gamma released by lymphocytes confronted with M. tuberculosis specific antigens [16]. The sensitivity and specificity of QuantiFERON are 89% and 99%, respectively, while EliSpot has the sensitivity of 98.8% and a specificity of 100% [38]. Unlike tuberculin skin test (TST), it detects disease in patients who have been vaccinated against BCG (latent infection)--and active infection too.

These tests are still not in routine-practice in our midst, because of high cost and laborious cell extract procedure from culture to antigen preparation (particularly in EliSpot).

10.2.3. Histopathology. Histopathology of a skin biopsy shows granulomatous presentations as those of cutaneous diseases with different etiology--cutaneous leishmaniasis, tuberculid leprosy, superficial granulomatous pyoderma, cutaneous sarcoidosis, lupus miliaris disseminatus faciei, and chromomycosis [16, 19, 33]. Meanwhile, the exact elucidation in diagnosis of cutaneous tuberculosis could not be done; however, the characteristic feature (well-formed granulomas with absence of caseous necrosis, granulomas with caseous necrosis, and the presence of poorly formed granulomas with intense caseous necrosis) would be auxiliary to differentiate types of cutaneous tuberculosis (Table 3) [16, 19, 21, 26, 28, 33, 39].

The equivocal manifestation of cutaneous tuberculosis to correlate the histologic with clinical observations in an evidence-based diagnosis is imperfect and lacking pragmatics.

10.2.4. Diagnosis by Test: Staining and Culture. The mycobacterial cell wall is rich in complex lipids which resists the acid and alcohol; hence the pathogen is termed as acid-fast bacilli (AFB). Staining techniques include Ziehl-Neelsen (common in practice), Kinyoun, and fluorochrome-based techniques with auramine-rhodamine. Microscopic observation of AFB in staining of tissue or secretions enables the empiric therapy if there are sufficient clinical suspicions. However, this does not necessarily suggest the cutaneous tuberculosis, since the other pathogens like Nocardia, Corynebacterium, nontuberculous mycobacteria, and even artifacts may reveal acid-fast characteristics [38, 40].

Furthermore, the lower sensitivities of staining results in extrapulmonary compared to pulmonary tuberculosis limit the applicability of the test [16, 37, 38]. The cultures of the pathogen, Mycobacterium tuberculosis, on specific solid media or by automatic detection of its metabolites in liquid media remain the gold standard method, for identifications and their drug sensitivities. However, the long generation time of the pathogens to grow and lower sensitivity of culture results for lesions and tissue samples attribute further challenges in prompt and accurate diagnosis of cutaneous tuberculosis [16, 38].

10.2.5. Amplifications of Nucleic Acids (PCR). The detection of Mycobacterium genus using bacterial 16S ribosomal DNA with PCR assays is now termed as a milestone in a diagnosis of pulmonary tuberculosis and several forms of cutaneous tuberculosis. DNA present in a sample of fresh tissues, blood, or a paraffin block even formalin fixed paraffin embedded sections, is amplified and it can then be identified, confirming the presence of mycobacteria [16, 33, 41].

PCR assay has augmented sensitivity and specificity in the diagnosis of cutaneous tuberculosis (Table 4) [42-55]; nevertheless, like other diagnostic approaches it is inconclusive in paucibacillary forms due to unevenly microbial distributions [25, 45].

10.2.6. Genotyping. Genotyping, the recent advance in the diagnosis of cutaneous tuberculosis, has a tendency to separate atypical mycobacteria from Mtb--and detect mutant if it persists inducing drug resistance in the pathogen. The major molecular typing methods--Spoligotyping, MIRU-VNTR (Mycobacterial Interspersed Repetitive Unit-Variable Number Tandem Repeats), and RFLP--detect Mycobacterium tuberculosis, DNA, or RNA in clinical specimens by in vitro nucleic acid amplifications, empowering investigations into epidemiology, transmission, and PTB outbreaks [56]. The clinical applicability testing of these genotyping techniques was also accessed in the patients with cutaneous tuberculosis in China by Ziang et al., 2017, with augmented sensitivity and specificity [57].

10.2.7. RFLP (Restriction Fragment Length Polymorphism). The gold standard in genotyping, IS6110-based restriction fragment length polymorphism (RFLP), has been for more than an epoch; however, it is laborious and costly and requires a large amount of chromosomal DNA [56].

10.2.8. Spoligotyping. Spoligotyping--commonly used to differentiate Mycobacterium tuberculosis complex strain--is based on polymorphisms of the chromosomal direct repeat (DR) locus, which contains a variable number of short DRs interspersed with nonrepetitive spacers [56, 57].

10.2.9. Mycobacterial Interspersed Repetitive Unit-Variable Number Tandem Repeat (MIRU-VNTR). Lately, the International consortium has proposed MIRU-VNTR as a standardized genotyping scheme, with 15- and 24-locus sets proven to have ample discriminatory power for tracing transmission and investigating the phylogenetics of tuberculosis [57].

11. Conclusions

In a limelight, almost all of the investigative methods confer lesser sensitivity and specificities for cutaneous tuberculosis, considering atypical erythema nodosum, nonspecific appearance, insufficiently elucidative radio-imaging approaches, histopathology features, and even microbial culture techniques too. The genotyping techniques, nevertheless, could be an assistant to cope with this diagnostic challenge, paradoxically beyond reach to the third world like ours, due to expensive running cost and wanting equipped laboratory setup. In this perspective, the clinicians must resort to every possible test, so that supporting positive rudiments would be ancillary in the early and precise diagnosis of cutaneous tuberculosis.

Abbreviations
AFB:       Acid-fast bacilli
MDR-TB:    Multiple drug resistant tuberculosis
MIRU-VNTR: Mycobacterial Interspersed Repetitive
           Unit-Variable Number Tandem Repeat
Mtb:       Mycobacterium tuberculosis
NTP:       National Tuberculosis control Programme
PCR:       Polymerase chain reaction
TST:       Tuberculin skin test
XDR-TB:    Extensively drug resistant tuberculosis.


Conflicts of Interest

The authors declare that they have no conflicts of interest.

https://doi.org/10.1155/2018/7201973

Acknowledgments

The authors would like to thank Professor Dr. Jeevan Bahadur Sherchand (Department of Microbiology, Institute of Medicine) and Professor Dr. Dwarika Prasad Shrestha (Department of Dermatology and Venerology, Institute of Medicine).

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Priyatam Khadka, (1,2) Soniya Koirala, (3,4) and Januka Thapaliya (2)

(1) Department of Microbiology, Tribhuvan University Teaching Hospital, Kathmandu, Nepal

(2) M.Sc. Medical Microbiology, Tri-Chandra Multiple Campus, Tribhuvan University, Nepal

(3) Department of Dermatology and Venerology, Tribhuvan University Teaching Hospital, Kathmandu, Nepal

(4) M.D. Dermatology, Maharajgunj Medical Campus, Tribhuvan University, Nepal

Correspondence should be addressed to Priyatam Khadka; khadka.priyatam@gmail.com

Received 7 April 2018; Accepted 25 June 2018; Published 9 July 2018

Academic Editor: Luigi Naldi

Caption: Figure 1: Erythematous plaque (2*1 cm) of lupus vulgaris on right forearm of a 17-year-old female with a history of trauma forming a linear scar (4 * 2 cm), visiting TUTH.

Caption: Figure 2: (a) Multiple erythematous papules of lupus vulgaris below lateral malleolus of right foot of 34-year-old female with a history of trauma on the right foot working in field 6 months earlier (before treatment). (b) The erythematous plaque reduced but did not resolve completely after antitubercular therapy; antitubercular therapy continued for three more months.
Table 1: Clinical manifestations of cutaneous tuberculosis and its
differential diagnosis.

S. N    Classification of cutaneous       Diagnostic considerations
              tuberculosis

1       Exogenous      Tuberculosis     sporotrichosis, leishmaniasis,
        cutaneous         chancre         atypical mycobacteriosis,
       Tuberculosis                     syphilis, cat scratch disease
                                                and tularemia

                       Tuberculosis        paracoccidioidomycosis,
                      verrucosa cutis   leishmaniasis, sporotrichosis,
                                          tuberculosis verrucosa and
                                         chromomycosis. Lobomycosis,
                                          atypical mycobacteriosis,
                                         hypertrophic lichen planus,
                                             verrucous carcinoma,
                                        iododerma, bromoderma, verruca
                                          vulgaris, keratoacanthoma
                                           centrifugum and pyoderma
                                                   vegetans

2       Endogenous     Scrofuloderma          tertiary syphilis,
        cutaneous                          paracoccidioidomycosis,
       tuberculosis                     actinomycoses, lymphogranuloma
                                        venereum, bacterial abscesses,
                                              tumor metastasis,
                                        histiocytosis and hidradenitis

                         Orificial        bullous diseases, trauma,
                       tuberculosis       fungal diseases, syphilis,
                                        sarcoidosis, or squamous cell
                                                  carcinoma

                      Lupus vulgaris        basal cell carcinoma,
                                          sarcoidosis, discoid lupus
                                         erythematosus, Leprosy, Deep
                                              Fungal infections

                        Tuberculous      leishmania, sporotrichosis,
                           gumma            nocardiosis, atypical
                                         mycobacteria (Mycobacterium
                                        marinum), pyogenic infections
                                           (Staphylococcus aureus,
                                           Streptococcus), and deep
                                              fungal infections

                       Acute miliary        metastatic carcinomas
                       tuberculosis

3      Tuberculids    Papulonecrotic      pityriasis lichenoides et
                        tuberculid       varioliformis acuta (PLEVA),
                                         leukocytoclastic necrotizing
                                           vasculitis, pruritus and
                                              secondary syphilis

                          Lichen           lichen planus and lichen
                       scrofulosorum    nitidus, syphilid lichenoides,
                                        eczematid, keratosis pilaris,
                                        pityriasis rubra pilaris (PRP)
                                         and micropapular sarcoidosis

                         Erythema        erythema nodosum, cutaneous
                       induratum of       polyarteritis, pancreatic
                           Bazin        panniculitis, lupus profundus,
                                         subcutaneous sarcoidosis and
                                          cutaneous T-cell lymphoma

Table 2: TST result in different forms of cutaneous tuberculosis.

Clinical forms of cutaneous tuberculosis    Tuberculin skin test
                                            result

Tuberculosis chancre                        initially negative, but
                                              becomes positive during
                                              course of disease
                                              (usually after 15 days)
Tuberculosis verrucosa                      strongly positive
Lupus vulgaris                              usually positive
Scrofuloderma                               strongly positive
Orificial tuberculosis                      negative
Acute cutaneous miliary tuberculosis        negative
Papulonecrotic tuberculoid                  positive
Lichen scrofulosorum                        positive
Erythema induratum of Bazin                 positive

Table 3: Histopathological features of cutaneous tuberculosis.

Different forms of
cutaneous              Histopathological features       Observation of
tuberculosis                                                 AFB

Well-formed granulomas with absence of caseous necrosis

Lupus vulgaris        epidermis may be atrophic or        infrequent
                         hypertrophic, featuring
                     acanthosis, papillomatosis and
                       even pseudo-epitheliomatous
                     hyperplasia. Presence of well-
                      formed tuberculous granulomas
                        accompanied more often by
                    Langhans giant cells, or foreign
                       body-like granulomas in the
                            reticular dermis.

Lichen               non-caseating, epithelioid cell       not seen
scrofulosorum        granulomas in upper dermis and
                        around dermal appendages

Intermediate forms: granulomas with caseous necrosis

Tuberculosis          marked pseudoepitheliomatous       can be seen
verrucosa           hyperplasia of the epidermis with
cutis                   hyperkeratosis and dense
                      inflammatory cell infiltrate
                       consisting of neutrophils,
                    lymphocytes, and giant cells. The
                        presence of granulomatous
                     infiltrates is a cardinal sign

Primary cutaneous    it varies according to the time      decreased
tuberculosis        of inoculation; in recent lesions       number
                        there is the presence of
                        necrotizing neutrophilic
                    infiltrate with numerous AFB. At
                         a later stage there is
                       organization of granulomas

Acute miliary         skin consists of areas of an       can be seen
tuberculosis        inflammatory infiltrate composed
                    of lymphocytes, plasma cells, and
                         neutrophils with focal
                       superficial dermal areas of
                     necrosis and abscess formation
                    without true caseating granuloma.
                    The presence of acid-fast bacilli
                        with vascular thrombi is
                     characteristic of these lesions

Tuberculosis        there are tuberculoid granulomas,    not usually
orificialis           around a median, central, and         found
                    superficial ulcer accompanied by
                      caseous necrosis in the deep
                                 dermis

Papulonecrotic         lesions showed psoriasiform       not usually
tuberculid             epidermal hyperplasia, and           found
                       epithelioid granulomas with
                     lymphocytes and Langhans giant
                     cells with variable amounts of
                     necrosis seen in the upper and
                    mid dermis with a perifollicular
                              distribution

Poorly formed granulomas with intense caseous necrosis

Scrofuloderma         Massive central necrosis with      may be found
                      abscess formation and in many
                       cases, suppuration, traces
                     of granulomas can be observed at
                        periphery of the lesions

Metastatic          Central ulceration with abundant      frequently
abscesses and       caseous necrosis, surrounded by a      detected
gumma               rim of giant cells and macrophages
                             can be observed

Table 4: Sensitivity and specificity of PCR in the diagnosis of
cutaneous tuberculosis (literature review).

References and date      No. of samples

(Lee et al. 2016)             574

(Tan et al. 2001)             105

(Chawla et al. 2009)          104

(Agarwal et al. 2017)          70

(Salian et al. 1998)      60 (formalin
                         fixed paraffin
                           embedded)

(Ogusku et al. 2003)           37

(Negi et al. 2005)             37

(Abdalla et al. 2009)          34

(Hsiao et al. 2003)            34

(Lall et al. 2017)             31

(Khosravi et al. 2006)   30 (formaline
                             fixed)

(Ramam et al. 2013)            28

(Khine et al. 2017)            25

(Quiros et al. 1996)           20

References and date        Sensitivity (%)         Specificity (%)

(Lee et al. 2016)                51.1                    86.3

                                 100             100 (multi-bacillary
                                                        form)

(Tan et al. 2001)             Overall 73            not calculated
                          (positivity of 55%    (pauci-bacillary form)
                             in cases of
                             tuberculosis
                         verrucosa and 60% in
                            cases of lupus
                         vulgaris; positivity
                         of 54% for cases of
                         erythema induratum)

(Chawla et al. 2009)             74.1                    96.1

(Agarwal et al. 2017)            24.5               not calculated

(Salian et al. 1998)             73.6                    100

(Ogusku et al. 2003)             43.7                    90.4

(Negi et al. 2005)               95.2                    100

(Abdalla et al. 2009)             88                      83

(Hsiao et al. 2003)               56                not calculated

(Lall et al. 2017)               25.8               not calculated

(Khosravi et al. 2006)            75                not calculated

(Ramam et al. 2013)               25                     73.7

(Khine et al. 2017)               52                not calculated

(Quiros et al. 1996)              85                not calculated
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Author:Khadka, Priyatam; Koirala, Soniya; Thapaliya, Januka
Publication:Dermatology Research and Practice
Article Type:Report
Date:Jan 1, 2018
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