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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 2319 - 7 May 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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2 year old male with erythematous plaques; biopsy from axilla. R/o urticaria pigmentosa


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IgorSC

Posted

The histological findings are those of Pityriasis rosea. CPC is needed.

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John Zhang

Posted

I agree PR is a good thought, but I also want to add lichen striatus.

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Meenakshi Batrani

Posted

Histological d/d could be PLC, PR, Lichen striatus. Need CPC for definitive diagnosis. 

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Krishnakumar subramanian

Posted

spongiosis with lymphocyte exocytosis. there are extravasated RBCs in the dermis close to epidermis. there is lymphocytic infiltrate around the acrosynringeal duct

I favor Pityriasiform spongiotic dermatitis-however I am not able to see Mond like PK, second PR is annular but plaque like presentation-

Dermatophytosis- May be a PAS stain -rare

 

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vincenzo

Posted

I thought of a PR of Gilbert too, because of many dermal and intra-epidermal RBCs and spongiosis with lymphocytic exocytosis. There aren't any mound parakeratosis, so also this case is difficult!  But PR is my first spot. 

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John Zhang

Posted

lichen striatus is my first spot because of the patient's age.

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vincenzo

Posted

Yes! LS could be a better spot! I didn't place much value on perivascular and peri-eccrine inflammatory infiltrate...

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Dr. Mona Abdel-Halim

Posted

Agree with LS

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Krishnakumar subramanian

Posted

Madam what is the final diagnosis

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Uma Sundram

Posted

Hi everyone! Sorry for the delay in post. Busy planning for London Dermpath Symposium next week. Hope all of you can make it.

Patient had classic linear lesions of lichen striatus. PR (pityriasis rosea) is also an excellent thought.

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