Case Number : Case 2232 - 2 January 2019 Posted By: Uma Sundram

Poroma/ Hidradenoma.

Sebaceoma. There are a couple of mature sebocytes in the upper left of the last picture with scalloped nuclei The immature cells are small and so are their nucleoli. Don’t see necrosis or mitotic figures.

Sebaceoma, I can see some sebocytes. 

Sebaceoma for me too.

I would search for Muir Torre Syndrome.

The distinction betwenn Sebaceoma and Sebaceous Carcinoma is sometimes very subjective (in my opinion)

Mm!! I think this is a Seborrheic Keratosis with sebaceous differentiation. The follicular infundibulum is actually the most favorite target as origin of SK. So sebaceous differentiation isn't unexpected. There are keratin cysts, as good markers of SK. 

Sebaceoma

seborrheic keratosis

Poroma or poroid hidradenoma. ( poroid cells, cuticular cells and granulation tissue like stroma).

I think I was wrong initially. It looks more like poroma (particularly the architecture), it is super blue hard to interpret just based on these images

I agree with Dermpath1 and Henry.The puzzling part of this tumor is the sebaceous differentiation , which has been described previously in Hidraadenomas.

I went through all the same considerations as above. I suppose it's a mixed follicular-ductal-sebaceous unit neoplasm. Could call is seborrhoeic keratosis-like poroma/hidradenoma with focal sebaceous differentiation. It's benign!

Poroma with seb diff.

Poroma.