Eccrine spiradenoma in knee

Abstract

Eccrine spiradenoma is an uncommon benign adnexal tumor of the eccrine sweat glands. Although it can occur at any age, it is most common in young adults without any sex predilection. Malignant transformation is rare, presenting as rapid increase in size of a long-standing lesion. Here, we report a case of eccrine spiradenoma in a 35-year-old man who presented with swelling over the right knee, with cytological atypia but no recurrence until date.

Keywords: Cytological atypia; benign adenexal tumour; eccrine spiradenoma; eccrine sweat gland.

Figure 1

Gross examination of the resected specimen showing pink-blue nodular lesion with adherent normal looking skin

Figure 2

Cut surface of the specimen of eccrine spiroadenoma

Figure 3

several sharply delineated, basophilic nodules in the dermis without any connection with the epidermis

Figure 4

H and E stained section of eccrine spiroadernoma showing two cell population small basoloid cell at the periphery and large pale cell at the center, few cell also show atypia, ×400