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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 1867 - 25 July - Dr Iskander Chaudhry (Invited) Posted By: Guest

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22F, Right nose shave excision. Mole present 2 years. Scabbing, changing. ?Inflamed IDN. Exclude MM.

Edited by Admin_Dermpath


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Cem Leblebici

Posted

Combined trichoblastoma and melanocytic nevus. (?Blue nevus).

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urmilapandey

Posted

combined naevus with benign hair follicle lesion (?hamartoma)

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Dr. Mona Abdel-Halim

Posted

Concurrent intradermal nevus and trichoepithelioma

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Raul Perret

Posted

Just to widen the differential, I think follicular induction changes overlying a nevus should be considered in the differential. I think we see connection of the basaloid structures to the overlying epidermis and as the authors discuss in their article, this overrules the diagnosis of trichoepithelioma.

 

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Dr. Mona Abdel-Halim

Posted

1 hour ago, Raul Perret said:

Just to widen the differential, I think follicular induction changes overlying a nevus should be considered in the differential. I think we see connection of the basaloid structures to the overlying epidermis and as the authors discuss in their article, this overrules the diagnosis of trichoepithelioma.

 

Nice possibility Raul!

Thanks for the paper but does this include papillary mesenchymal body formation? I think we have one in figure 4. 

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Raul Perret

Posted

13 minutes ago, Dr. Mona Abdel Halim said:

Nice possibility Raul!

Thanks for the paper but does this include papillary mesenchymal body formation? I think we have one in figure 4. 

Yes Mona, they do mention PMB should not be present. But I do think the changes here are rather subtle for TE. I must confess that I am not a supporter of diagnosing concurrent/collision tumors but rather trying first to discard a common etiology to what seems to be multiple and hazardous.

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Arif Usmani

Posted

Trichoepitheliomatous proliferation with possible Merkel cell hyperplasia in a nevus

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Nitin Khirwadkar

Posted

Combined trichoblastoma and dermal naevus. 

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Arash Daryakar

Posted

combined IDN and Trichoepithelioma

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Admin_Dermpath

Posted

Dear All thank you for your comments. The final diagnosis was IDN with a trichoepithelioma. I would be interested why some use the term trichoblastoma for this case ? For the reasons stated above (PMBs) we did not call this follicular induction although I agree with Raul's point! 

 

Iskander

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Robledo F. Rocha

Posted

On Dr. Iskander’s query, I use no more the term trichoepithelioma since the WHO Classification of Skin Tumors have followed the nomenclature proposed by Dr. Ackerman, in which trichoblastoma is every adnexal cutaneous tumor with differentiation toward both follicular germinative epithelium and specific follicular stroma. Trichoepithelioma is merely a synonym for some microscopic variants of trichoblastoma.

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