ABPath Dermatopathology Practice Questions - ABPath Dermatopathology Subspecialty Certification Examination Exam

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A spongiotic dermatitis biopsy shows alternating ortho- and parakeratosis in both vertical and horizontal directions, follicular plugging with shoulder parakeratosis, and small islands of normal skin within affected areas (the 'islands of sparing' clinically). The most likely diagnosis is:

Pityriasis rubra pilaris Psoriasis Atopic dermatitis Seborrheic dermatitis

Correct Answer:

Pityriasis rubra pilaris

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