Clear cell hidradenoma of the eyelid: a case report.

Sweat gland tumours are extremely rare in the eyelids. We report a case of a clear cell hidradenoma (nodular hidradenoma) in an elderly female, who had presented with a nodular swelling in a eyelid. Clear cell hidradenomas arise as intradermal nodules from eccrine sweat glands. Ultrastructural and enzyme histochemical studies have shown nodular hidradenomas to be intermediate between eccrine poroma and eccrine spiradenoma. No apocrine differentiation has ever been observed in these tumours. Malignant forms are distinctly unusual. This case is being documented for the extremely uncommon presentation of this tumour as an eyelid mass. Complete primary excision is advocated and local steroid preparations should bot be used.

Cellular blue nevus with nevus cells in regional lymph nodes: a lesion that mimics melanoma.

We report the case of a young man who had a large, firm, nodule covered by darkly pigmented skin over the outer aspect of the right ankle and palpable right inguinal lymph nodes. The mole had enlarged rapidly during the past month, contained deeply pigmented cells with increased cellularity and mitotic activity and groups of intensely pigmented nevus cells within the marginal sinus of the inguinal nodes. The excised mass with inguinal lymphadenectomy was reported as benign cellular nevus with benign nevus cell aggregates in lymph nodes. The purpose of this report is to emphasize how cellular blue nevus can masquerade as malignant melanoma and to increase clinical awareness of this benign variant of melanocytic nevus. We have attempted to elaborate its natural history and comprehensive criteria for diagnosis, so that inappropriate surgery and chemotherapy can be avoided in this lesion which occurs conceivably often enough to be more than just a curiosity.