A 50-year-old man has large, thin, scaly, poikilodermatous patches on the trunk and proximal extremities for 3 years. Biopsy shows a sparse lymphocytic infiltrate with epidermotropism of atypical lymphocytes. The most important association is:

• A Pityriasis rosea
• B Psoriasis
• C Lichen planus
• D Mycosis fungoides ✓

Explanation

Large plaque parapsoriasis is considered a precursor to mycosis fungoides. The presence of atypical lymphocytes with epidermotropism supports this association. Small plaque parapsoriasis is benign. Psoriasis, lichen planus, and pityriasis rosea have distinct histopathological features.

Reference: Bolognia's Dermatology, 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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