In this section we have spot diagnoses posted on a daily basis since June 2010, now over 1700! You can review the archived cases and read the suggested diagnoses by users and the final comment by Dr Uma Sundram, the Editor-in-Chief and main spot diagnosis host. Case are uploaded each week day by 10 a.m. UK time with the correct diagnosis will generally be posted at 8 p.m. UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : Case 2467 - 31 December 2019 Posted By: Uma Sundram

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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33 year old female with perianal, slowly growing nodule


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dermpath1

Posted

Just to add that some time it is difficult to differentiate Hidradenoma papilliferum from  neoplasms with apocrine differentiation such as tubular apocrine adenoma, syringocystadenoma papilliferum, and apocrine cystadenoma (apocrine hidrocystoma).

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Uma Sundram

Posted

Hidradenoma papilliferum.  Agree with dermpath1's comments, however. 2 unusual things about this case. 1. The presence of obvious apocrine differentiation/metaplastic change. 2. Perianal location. Happy New Year to all!

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