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 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.
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15 year old male with enlarging lesion at back of head.


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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

Posted

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

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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

Posted

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

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