Case Number : Case 1923 - 12 Oct - Dr Richard Carr Posted By: Guest

Irritated seborrheic keratosis with sebaceous differentiation?

Collision tumour- SK + hydradenoma

What about a SK(irritated variant), with some bowenoid change(last pic)?

Ok there is an insistent ductal differentiation...but my impression is of a follicular/follicle-sebaceous type, and am not able to understand what does it means.

My impression was sebk with ductal differentiation

Hybrid seb K and poroid lesion (suspecting early porocarcinoma changes)

On review,SK + poroma seems to be a better bet

I called it seborrheic keratosis and poroma/hidradenoama (poroid type). I did not think there were features to indicate malignancy. The two lesions, although clearly abutting, seemed quite distinct morphologically but it is interesting that SEBK has been seen on a number of occasions (by myself) in combination with porocarcinomas. I guess it could still be coincidence with SEBK being such a common lesion but does make me wonder. I've always considered SEBK to be infundibular origin rather than acrosyringeal based on their lack of occurrence on glabrous (non-hair bearing sites) skin.