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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 925 - 8th January Posted By: Guest

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
Submitted Date :
   (0 reviews)
15 year-old male with a chronic prepatellar mass, right knee.

Case posted by Dr. Hafeez Diwan.
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  Report Record
Go to records January 2014

User Feedback


Sasi Attili

Sasi Attili 85

Posted

Deep GA vs Rheumatoid Nodule. Age is more in keeping with deep GA. Mucin is the differentiating feature. Can't be certain on these H&E pics.

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Guest Tiberiu Tebeica

Guest Tiberiu Tebeica

Posted

I agree this might be a palisading granulomatous process, but I would stain it with cytokeratins and EMA to exclude an epithelioid sarcoma.

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Robledo F. Rocha

Robledo F. Rocha 336

Posted

It might be subcutaneous granuloma annulare or rheumatoid nodule. I favor the former over the latter because the center of histiocytic palisades contains mucin rather than fibrin.

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Guest Ali Y. Hashim

Guest Ali Y. Hashim

Posted

Palisading granuloma, favoring granuloma annulare.

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Dr. Hafeez Diwan

Dr. Hafeez Diwan 125

Posted

I called this deep granuloma annulare.

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