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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 868 - 16th October Posted By: Guest

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
Submitted Date :
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40 year-old male with a lesion on his left thigh.

Case posted by Dr. Hafeez Diwan.


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Guest Romualdo

Posted

I see the nests of neoplastic cells within an acanthotic epidermis, so I would call this lesion hidroacanthoma simplex. To call a lesion poroma I would like to see it at a lower level within the dermis, although extensively conected to the epidermis.

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Sasi Attili

Posted

[color=#1C2837][font=arial, verdana, tahoma, sans-serif][size=4]Hidroacanthoma simplex[/size][/font][/color]

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Romualdo, as far as I understand an intraepidermal eccrine poroma = hidroacanthoma simplex. It is the same thing is it not?

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Robledo F. Rocha

Posted

Lesion of poroma group combining patterns of hidroacanthoma simplex (Borst-Jadassohn-like intraepidermal aggregates in picture #1) and classic poroma (interconnected aggregates in picture #2).

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Guest Romualdo

Posted

Yes, hidroacanthoma simplex is an intraepidermal variant of poroma. As we all know, three variants of poroma exist: hidroacanhoma simplex, eccrine poroma or simply poroma, the dermal-epidermal form, and dermal duct tumor (Winkelman-Mc Leod), the dermal variant. As pathologists, we try to be the more specific as we can, so I think this tumor fits more with hidroacanthoma simplex.

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Guest Jim Davie MD

Posted

I will add pigmented clonal seborrheic keratosis to the differential. A CEA stain showing positive staining of the small and large lumenal spaces would confirm it being a poroma.

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Dr. Hafeez Diwan

Posted

I called this hidracanthoma simplex.

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