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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 4074 - 01 September 2022 Posted By: Saleem Taibjee

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
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54F Excision right upper arm Anetoderma ?cause


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Anil Patki

Posted

Dermatofibroma. Collagen trapping and epidermal induction are characteristic.

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msofopoulos

Posted

Look like dermatofibroma with overlying basaloid induction and collagen entrapment

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Would get a CD34 to exclude Plaque-like CD34-positive dermal fibroma or plaque-like DFSP.

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vincenzo

Posted

On 05/09/2022 at 19:19, msofopoulos said:

Look like dermatofibroma with overlying basaloid induction and collagen entrapment

Agree. A plaque like DF for me. 

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Eman El-Nabarawy

Posted (edited)

Atrophic dermatofibroma with overlying follicular induction.

Edited by Eman El-Nabarawy

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Saleem Taibjee

Posted

Yes, well done, an example of dermatofibroma with striking overlying follicular induction. I resisted to request a CD34 because this really must be dermatofibroma. Follicular induction is well-recognised in DF, and I have also attempted to show the focal lipidisation (penultimate image) and peripheral collagen entrapmen (final image) which are also typical of DF and help to distinguish from other entities such as DFSP.

Over the years I have come to realise that Dermatofibroma on the upper arm/shoulder is something of a special site. DF is often rather atrophic and not at all obvious clinically.

BW, Saleem

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