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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 2724 - 15 December 2020 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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43 year old male with scalp lesion.


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Victor Delgado

Posted

There is a nodular lesion almost located on deep dermis and subcutis, surrounded by basement membrane. The tumor is made up of confluent, lobulated and well defined nest of keratinocytes with a little bit of peripheral palisading, squamous eddies, a few diskeratotic cells, mitotic activity, trichilemmal keratinization and non infiltrative border.

To me, this is a proliferating trichilemmal cyst.

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Krishnakumar subramanian

Posted

Proliferating trichilemmal cyst.

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Uma Sundram

Posted

Proliferating trichilemmal cyst. I loved Victor's write up! Thank you.

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Uma Sundram

Posted

Sorry, a slight edit. Proliferating trichilemmal tumor. As some of these are locally aggressive, the moniker of tumor is used to better document their uncertain malignant behavior.

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