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In this section we have spot diagnoses posted on a daily basis since June 2010, now over 4000! You can review the archived cases and read the suggested diagnoses by users and the final comment by the contributors.
Case are uploaded each week day by 10 am UK time with the correct diagnosis will generally be posted at 8 pm UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : Case 984 - 1st April Posted By: Guest

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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The patient is a 64-year-old white man with a shave biopsy of a pink papule taken from the middle aspect of the chest.

Case posted by Dr. Mark Hurt.

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Robledo F. Rocha


It’s a classic poroma with typical anastomosing trabeculae arising from the undersurface of the epidermis composed of small poroid cells and squamoid cuticular cells, the latter lining ductal structures. Areas of necrosis en masse can be found.
I confess I’m a bit confused about the mitotic index since the expression of Ki-67, which highlights proliferating cells in interphase and during mitosis, is not proportional to the expression of pHH3, which highlights cells in mitosis only.

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