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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 1542 - 23 May 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 36 year old woman with a punch biopsy taken from the intermammary chest.

Dr Mark Hurt


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Acanthosis nigricans vs. confluent and reticulated papillomatosis vs. epidermal naevus.

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Dr. Mona Abdel-Halim

Posted

Confluent and reticulated papillomatosis. Typical site.

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Guest Arash Daryakarr

Posted

Epidermis show papillomatosis,acanthosis,hyperkeatosis and basal hypermelanosis.underlying skin has mild perivascular lymphocytic infiltrate with few melanophages. in this area this is suggestive of CARP in proper clinical context. Although, distinction from acanthosis nigricans is not easy for me based on morphology.in fact,some consider it as a variant of acanthosis nigricans according to clinical and histopathological similarity.

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vincenzo polizzi

Posted

Confluent and Reticulated Papillomatosis. It fits enough with age, chest localization and with histological confluent and retiform pattern of thinned epidermis,

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IgorSC

Posted

Agree with Confluent and reticulated papillomatosis. Clinical and histological pictures fit with this diagnosis.

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biswanath behera

Posted

Typical site with histology suggestive of CARP. 

 

Other differentiaalls are AN and VEN

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Mark A. Hurt MD

Posted

Yes, very good!.  This was CARP clinically and histopathologically.  PAS was negative for Pityrosporum.

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