An Enlarging cyst of the penis: Unusual presentation of a cystic disorder.
A 38-year-old man presented with complaints of two asymptomatic nodulocystic lesions over dorsum of penis since last 6 years which enlarge gradually. There was no history of discharge or bleeding. There was no other significant history.
On examination the lesions appeared as dome shaped soft skin-coloured smoothed surface nontender nodulocystic lesions over dorsum of the anterior aspect of penis. One large nodule like swelling was around 1cm in size and another was around 0.5 cm (Figure 1). During surgical excision it was found those both were cysts and were interconnected (Figure 2). After removal of one of the cysts spontaneous remission of other ensued. Physical examination and laboratory investigations were otherwise unremarkable.
Histopathological examination (HPE) of cystic lesions revealed a normal epidermis and the dermis showed a large cystic space with papillary projections. The cyst was single composed of interconnecting cavities and was free from the overlying epidermis (Figure 3).
The inner surface of the cyst and the papillary projections were lined by a row of columnar secretory cells of variable height which showed decapitation secretion. Peripheral to the layer of secretory cells were elongated myoepithelial cells and their long axes were running parallel to the cyst wall.
What is your diagnosis
Penile apocrine hidrocystoma
Apocrine hidrocystomas (AHC) or cystadenomas are benign cystic lesions of the secretory portion of apocrine sweat glands. Robinson was the first to describe AHC in 1893.  AHC occurs commonly on the face but it is occasionally seen on the ears scalp chest shoulders or vulva.  This condition has been noted over the penis in only three instances in Pubmed. [3 4 5]
Hidrocystomas (HCs) are conventionally divided into apocrine and eccrine HC by histologic features and as solitary (Smith type) or multiple (Robinson type). AHCs are cystic lesions that arise from the apocrine secretory coil while eccrine -HCs represent retention cysts of the eccrine duct. 
AHC is not uncommon often seen in ophthalmological or surgical clinics. It is found in adult life with no predilection for age and gender. The lesions are solitary or occasionally multiple well-dened dome- shaped translucent nodules. The surface of the cyst is smooth and the colour varies from a skin colour to greyish or blue-black often affecting only part of the cyst. It is commonly seen around the eye particularly lateral to the outer canthus. It has also been rarely reported over the penis ngers and as multiple lesions bilaterally in both axillae. The lesions are not associated with any symptoms. The cyst increases slowly in size and may become 1cm or more in diameter. Multiple lesions may be seen in SchAlpfSchulzPassarge syndrome (a form of ectodermal dysplasia syndrome characterized by hypotrichosis hypodontia nail dystrophy palmoplantar keratoderma and periocular apocrine hidrocystomas).
Our case showed typical lesional presentation with involvement of an unusual site- penis.
On HPE epidermis is unremarkable. The dermis contains one or several large cystic spaces into which papillary projections often extend. The cavity walls are lined by cuboidal or high-columnar apocrine secretory cells with decapitation secretion and a peripheral layer of myoepithelial cells. The secretory cells may contain pigment which is neither melanin nor haemosiderin. The secretions in the cysts may be coagulated and stained using the PAS technique. There is a well-organized brous stroma. [2 7] In our case HPE showed characteristic features of Hidrocystoma and there was no feature of malignancy.
Median raphe cyst (MRC) is the closest differential diagnosis of AHC. We excluded by the following points. Clinically MRC develops anywhere along the midline of the ventral side of the male genital area from the meatus to the scrotum and perineum. Histopathologically it is lined by pseudostratified columnar epithelium (one to four cell layers thick) mimicking the transitional epithelium of the urethra.  In our case cysts over the dorsum of penis and HPE were suggestive of APH.
The tumour is cured by surgical removal. Multiple lesions have been treated successfully with trichloroacetic acid.  Topical atropine or scopolamine electrodesiccation carbon dioxide laser and pulse dye laser have been used with good results. We excised the lesion
1. Robinson AR. Hidrocystoma. J Cutan Genitorurin Dis. 1893;11:293-303
2. Warrier S Mohammed K Safia B. Multiple apocrine hidrocystoma-an uncommon presentation. Indian J Dermatol Venereol Leprol. 2003;69:64-5.
3. Lopez V Alonso V Jorda E Santonja N. Apocrine hidrocystoma on the penis of a 40-year-old man. Int J Dermatol. 2013;52:502-4.
4. Samplaski MK Somani N Palmer JS. Apocrine hidrocystoma on glans penis of a child. Urology. 2009;73:800-1.
5. Mataix J BaAuls J Blanes M et al. Translucent nodular lesion of the penis. Apocrine hidrocystoma of the penis. Arch Dermatol. 2006;142:1221-6.
6. De Viragh PA Szeimies RM Eckert F. Apocrine cystadenoma apocrine hidrocystoma and eccrine hidrocystoma: three distinct tumors defined by expression of keratins and human milk fat globulin 1. J Cutan Pathol. 1997;24:249- 55.
7. Calonje E. Tumours of the skin appendages. In: Burns T Breathnach S Cox N Griffiths C editors. Rook's Textbook of Dermatology 8th ed. Singapore: Wiley-Blackwell; 2010. p.53.1-44.
8. Dailey RA Saulny SM Tower RN. Treatment of multiple apocrine hidrocystomas with trichloroacetic acid. Ophthal Plast Reconstr Surg. 2005;21:14850.
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|Publication:||Journal of Pakistan Association of Dermatologists|
|Article Type:||Case study|
|Date:||Dec 31, 2014|
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