A skin biopsy shows 'test tube in a rack' rete ridge lengthening, thinning of the suprapapillary plates, and Kogoj pustules. What is the diagnosis?
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Correct answer: Psoriasis vulgaris
The 'test tube in a rack' appearance refers to the regular elongation of rete ridges in psoriasis. Kogoj pustules are spongiform accumulations of neutrophils in the upper spinous layer, often seen in this condition.
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