ANAL hidradenoma of an apocrine sweat gland is a noninvasive and nonmetastasizing neoplasm. Surgical excision apparently cures. Misdiagnosis of this lesion as an adenocarcinoma may lead to serious consequences and major surgery. Two cases are herein presented to illustrate the benign nature of the growth and the successful removal without recurrence. The microscopic characteristics of this lesion of the apocrine sweat gland are papillary structure, dome-shaped eosinophilic epithelial cells, myoepithelial elements with no mitotic figures, no invasion, papillary projections into the acini of the glands, and a striking eosinophilic border of cytoplasm.
The apocrine sweat glands in the anal canal may be a site of infection or neoplasm. So many cases of infection in these glands (hidradenitis) have been reported that this clinical entity has advanced from the field of obscurity and confusion to a disease which is recognized by most surgeons. It is necessary now to stress the importance