|Pathology of Hidradenoma
(papillary hidradenoma) is a
benign tumour and was previously regarded as an apocrine tumour.
According to some authors this tumour is a variant of apocrine adenoma with specific features.
Now there is increasing evidence to suggest that it is closely related to the recently described mammary-like anogenital glands.
Site: Almost always located in the vulval or perianal regions. Ectopic lesions have been reported on the face, scalp, eyelid, auditory canal and arm.
Clinical presentation: The tumour usually occurs in middle aged women as small nodules (1cm or less in size).
The differential diagnosis includes adenocarcinoma.
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