A Large Lumbar Adnexal Neoplasm Presenting Characteristics of Eccrine Poroma and Poroid Hidradenoma

A Large Lumbar Adnexal Neoplasm Presenting Characteristics of Eccrine Poroma and Poroid Hidradenoma

Poroma is a rare benign neoplasm that derives from eccrine sweat glands epithelium. Its histological subtypes, with respect to its position within skin layers, are eccrine poroma, hidroacanthoma simplex, poroid hidradenoma, and dermal duct tumor. Poromas commonly exhibit benign clinical behavior as they are usually small and asymptomatic and do not exhibit malignant behavior. Although their his...

Poroid Hidradenoma: An Uncommon Cutaneous Adnexal Neoplasm

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Poroid hidradenoma.

A 65-year-old male presented with a slowly enlarging nodule on his right leg, which had been present for 10 years and which had gradually increased in size over the previous 6 months. Physical examination revealed a red and dark bluish, dome-shaped nodule, 26 mm × 22 mm in size, on the right side of the posterior aspect of his right leg (Fig. 1). Histopathology revealed a well-demarcated, solid...

Poroid hidradenoma: a case report.

Poroid hidradenoma is a variant of the eccrine poroma that belongs to the group of poroid neoplasms. It presents architectural features of hidradenoma, with solid and cystic areas and tumour cells restricted to the dermis, and cytological features of poroid neoplasm such as poroid and cuticular cells. Poroid hidradenoma becomes malignant in less than 1% of cases, but its histologic characterist...

Papillary poroid hidradenoma.