Case Number : Case 2224 - 18 December 2018 Posted By: Uma Sundram

sinus like tract with inverted mucoepidermoid papilloma

Sebaceoma-like NEVUS SEBACEUS with apocrine-ductal changes and some abortive SCAP structures. 

Would like to do IHC - BerEP 4 and EMA to say the least. Looks like a BCC to me. 

Honestly I dont know whats going on here. But I like the idea of Vincenzo. i have never seen a similar case.

Waiting for more learning.

Please let us know what is the final diagnosis

Yes, my apologies, I always want to post the answer on tuesday but have to wait until you all have a chance to comment. Then of course wednesday starts...

It's a really interesting case, isn't it? We finally landed on poroid hidradenoma. The overall architecture is that of a hidradenoma with the cells of a poroma. We recommended a re excision, as BCC is certainly part of the differential. I also like a variant of nevus sebaceus with areas that look like syringocystadenoma papilleferum.

I personally have never seen an inverted mucoepidermoid papilloma outside of the eye, so favored this less.

Thanks a lot 

Poroma (inverted pattern).