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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 2987 - 17 December 2021 Posted By: Dr. Richard Carr

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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M75. Vertex of scalp: Pigmented lesion ?LM ?SEBK


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Looks like lentigo/macular SK. Could get MART/SOX to confirm but doesn't seem to be any significant increase in melanocytes.

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Dr. Richard Carr

Posted

Thanks all. We felt this was a case of solar lentigo and focal subtle actinic keratosis. No confluence of melanocytic nuclei on MelanA or Sox10 and only focal weak to moderate scattered PRAME positive small nuclei of doubtful significance as can be seen in sun-exposed skin. 

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