Eccrine poroma on the abdomen: A rare and atypical site

A 43-year-old man presented with a pink, fleshy, non-tender slowly growing sessile plaque on the left lumbar region of size 2.5 cm x 2 cm with a few overlying adherent scales present since 5 years [Figure 1]. Biopsy showed small uniform cuboidal cells with a central basophilic nucleus and pale eosinophilic cytoplasm arranged as micro follicles and connected by intercellular bridges. The periphery of the tumour showed multiple small tubular structures with basaloid eosinophilic structures [Figure 2]. Immunohistochemistry BerEP4 for Basal Cell Carcinoma (BCC) was negative and p63 was positive suggestive of eccrine poroma.

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Figure 1:

Sessile tumour on the abdomen with few adherent scales.

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Figure 2:

Small uniform cuboidal cells with a central basophilic nucleus and pale eosinophilic cytoplasm, arranged as micro follicles and differentiated from normal keratinocytes (Haematoxylin and eosin, 40x).

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Eccrine poroma is a benign adnexal tumour that originates from the intraepidermal eccrine ducts and accounts for 10% of the sweat gland tumours. Most of these tumours are located on the palms and soles but are rarely reported in unusual locations like the head and neck, upper and lower extremities and the nipple region. We report a case of eccrine poroma located in the left lumbar region.