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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 4609 - 17 March 2025 Posted By: Admin_Dermpath

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
Submitted Date :
   (0 reviews)
57M Back- Incisional biopsy Hypertrophic scaly, discoid plaques back and right knee (previously treated 2022 as plaque type psoriasis, responded to nail) Enstilar involvement? atypical psoriasis ? PLAQUE PSORIASIS
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Dr. Shoba Ramesh

Dr. Shoba Ramesh 0

Posted

Lichen simplex chronicus 

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Tausif Saleem

Tausif Saleem 0

Posted

Plaque psoriasis.

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Richard Logan

Richard Logan 0

Posted

I think there's too much inflammation and papillary oedema for lichen simplex.  The rete ridge fusion and patchy parakeratosis are somewhat suspicious of pityriasis rubra pilaris but the clinical description is rather against this.  On balance I would say this is atypical psoraisis - the pathology may have been modified by the steroid/calcipotriene therapy.

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