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?

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Case Number : Case 3418 - 7 October 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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40 year old male with lesion on scalp.

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vincenzo

Posted

Yes, a Poroma...but with an odd relationship to pilosebaous units, probably due to the onset in a nevus sebaceous.

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Arif Usmani

Posted

Poroid neoplasm with sebaceous differentiation arising in a nevus sebaceus. There are features of hidracanthoma simplex and close association with pilocebaceous structures suggests apocrine origin probably due to nevus sebaceus-influenced oncogenicity. 

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