Bone marrow evaluation in leprosy: clinical implications.
HLH has a well known association with disseminated tuberculous Mycobacterial infections; and even reported to occur following initiation of first line antituberculous drugs such as rifampin and isoniazid. (3) Although leprosy and tuberculosis have been the scourge of mankind for centuries, surprisingly, the association of HLH with leprosy was described only recently in a middle aged Tunisian man with MBL following the initiation of MDT with dapsone and rifampin; but responded well to corticosteroid. (4) Another report from China described a case of suspected HLH with low natural killer cell activity and high CD25 levels which preceded the histological diagnosis of MBL. (5) Dapsone, an integral component of MDT for leprosy, has been reported to cause HLH in a patient with Sezary syndrome.6 Moreover, dapsone is known to cause a hypersensitivity syndrome (dapsone syndrome) characterised by fever, skin rash, hepatosplenomegaly, hepatitis, and generalised lymphadenopathy. To make matters more intriguing, ENL (a Type II reaction in leprosy) presents with a similar clinical picture. In such a scenario, BM evaluation can be of great help to differentiate HLH from dapsone syndrome and Type II reaction.
Bone marrow evaluation in leprosy has been infrequently reported in the literature and in the majority of those cases, BM examination was performed either prior to or after establishing the diagnosis of leprosy for evaluation of cytopenia (s) and fever of unknown origin. (7-9) Suster et al. (7) demonstrated viable Lepra bacilli in BM aspirate smears by using modified Fite stain; and suggested that bone marrow may act as a reservoir for viable organisms in the absence of a host response in treated and untreated patients with MBL. The persistence of viable organisms in the BM in patients with MBL may account for the high rate of relapse and/or recrudescence of the disease following cessation of specific therapy. Bone marrow examination with the Fite modification of the acid-fast stain is therefore indicated in such patients to evaluate marrow involvement and the efficacy of treatment. (7) This may have a great clinical implication similar to the cutting edge discovery by Das et al. a few years ago, of hidden M. tuberculosis in the bone marrow stem cells. (10)
Considering the ethical issues involved in carrying out BM evaluation and with the available literature from the past, it is still a matter of debate whether marrow evaluation in leprosy should be done in all cases or restricted to specific clinical settings. The present report of HLH in MBL by Hpyvoll et al. (1) definitely adds a new dimension to the hematological aspect of this old disease.
(1) Hoyvoll LR, Floisand Y, Orrem HL et al. Hemophagocytic lymphohistiocytosis in leprosy. Lepr Rev, 2015; 86: 403-406.
(2) Henter JI, Horne A, Arico M et al. HLH-2004: diagnostic and therapeutic guidelines for hemophagocytic lymphohistiocytosis. Pediatr Blood Cancer, 2007; 48: 124-131.
(3) Padhi S, Ravichandran K, Sahoo JP et al. Hemophagocytic lymphohistiocytosis: An unusual complication in disseminated Mycobacterium tuberculosis. Lung India, 2015; 32: 593-601.
(4) Saidi W, Gammoudi R, Korbi M et al. Hemophagocytic lymphohistiocytosis: an unusual complication of leprosy. Int J Dermatol, 2015; 54: 1054-1059.
(5) Zeng XZ, Wang YN, Wang JS et al. A case of lepromatous leprosy complicated by hemophagocytosis misdiagnosed as hemophagocytic lymphohistiocytosis. Int J Infect Dis, 2014; 23: 28-30.
(6) Hiura Y, Kawabata H, Kanekura T et al. Hemophagocytic syndrome induced by diaminodiphenylsulfone. J Dermatol, 2007; 34: 730-731.
(7) Suster S, Cabello-Inchausti B, Robinson MJ. Nongranulomatous involvement of the bone marrow in lepromatous leprosy. Am J Clin Pathol, 1989; 92: 797-801.
(8) Binitha MP, Saritha S, Riaz N et al. Pancytopenia due to lepromatous involvement of the bone marrow: successful treatment with multidrug therapy. Lepr Rev, 2013; 84: 145-150.
(9) de Oliveira LR, Maltos AL. Mycobacterium leprae in bone marrow. Revista Brasileira de Hematologia e Hemoterapia, 2014; 36: 300-301.
(10) Das B, Kashino SS, Pulu I et al. CD271 + bone marrow mesenchymal stem cells may provide a niche for dormant Mycobacterium tuberculosis. Sci Transl Med, 2013; 5: 170ra13.
SOMANATH PADHI, Department of Pathology, Venereology, and Leprology, Pondicherry Institute of Medical Sciences, Pondicherry, India, 605014
VIJAY KRISHNA C, Department of Dermatology, Venereology, and Leprology, Pondicherry Institute of Medical Sciences, Pondicherry, India, 605014
Accepted for publication 20 January 2016
Correspondence to: Somanath Padhi, Department of Pathology, Pondicherry Institute of Medical Sciences, Pondicherry, India, 605014 (e-mail: firstname.lastname@example.org)
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|Author:||Padhi, Somanath; Vijay, Krishna C.|
|Article Type:||Letter to the editor|
|Date:||Mar 1, 2016|
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