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In this section we have spot diagnoses posted on a daily basis since June 2010, now over 4000! You can review the archived cases and read the suggested diagnoses by users and the final comment by the contributors.
Case are uploaded each week day by 10 am UK time with the correct diagnosis will generally be posted at 8 pm UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : Case 2349 - 18 June 2019 Posted By: Uma Sundram

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
Submitted Date :
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15 year old male with enlarging lesion at back of head.
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picture-4

Edited by Admin_Dermpath

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vincenzo

A well circumscribed basaloid and pigmented tumor, with lobular growth and follicular differentiation, without apoptosis or peritumoral mucin, but with some epithelial-stromal retraction ( a tricky finding ). There is a subtle peritumoral stromal component, fibroblastic and PMB-like. So I favor Trichoblastoma, probably developed in a sebaceous nevus.

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Alex-Ventura-Leon

Alex-Ventura-Leon 0

Posted

Nodular trichoblastoma in the setting of a nevus sebaceo. So agree.

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IgorSC

Agree. We can easly see the Sebaceous nevus on picture 3 and the pigmented trichoblastoma on the other pictures.

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Uma Sundram

Uma Sundram 169

Posted

That's it! Trichoblastoma arising in nevus sebaceus. I'm making these too easy for you guys!

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