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In this section we have Logan's cases 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.

Confluent and reticulated papillomatosis (CARP)

Operations Pathhub

By Operations Pathhub

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Case 843  10.9. 13  (M. Hurt)  F  15 scaly reticulated plaque on abdomen 

Invagination of hyperkeratotic stratum corneum into epidermis is a histological clue.  This biopsy also shows the fixation artefact of perinuclear clearing and ballooning of keratinocytes, similar to “birdseye” keratinocytes seen in plane warts. 

 

Case 1542   23.5.16  (M. Hurt)  F 36 intermammary 

I was initially thinking of PRP.  However, the epidermis shows blunt-topped papillomatosis.  The stratum corneum does not show the alternating para/orthokeratosis of PRP, but rather characteristic orthokeratotic invagination of the epidermis.  Rather psoriasiform acanthosis with some papillary oedema. 

DD: acanthosis nigricans; epidermal naevus. 

 

Case 2782  5.3.21 (R. Logan)  M 25 pigmented trunkal rash (*teaching) 

Characteristic changes of blunt-topped papillomatosis, and invagination of epidermis by hyperkeratotic stratum corneum. 

 

Case 4128  16.11.22 (H. Diwan) 16 macular rash on chest (*teaching) 

 

Case 4192  14.2.23  (U. Sundram)  F 19 hyperpigmented patches and papules 

PAS -ve. 

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