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Primary cutaneous spindle cell B-cell lymphoma of follicle origin mimicking acne rosacea.
American Journal of Dermatopathology 2015 June
Primary cutaneous spindle cell lymphoma is a unique morphologic variant of cutaneous B-cell follicle center lymphoma characterized by a prominent population of spindle-shaped, medium, and large B lymphocytes with a poorly formed storiform pattern.We report a case of a 35-year-old woman who presented with a well-defined erythematous plaque with 2 nodular, nontender nonscaling nonulcerated lesions on her right cheek mimicking acne rosacea. Microscopic examination revealed a tumor mainly centered in the reticular dermis and mostly composed of spindle-shaped large B lymphocytes exhibiting bizarre shapes with "boomerang-like" or "spermatozoa-like" appearance. The immunohistochemical staining demonstrated neoplastic lymphocytes positive for CD20, CD79α, and BCL-6, and negative for CD3, CD43, CD10, BCL-2, and MUM-1. These results supported the diagnosis of a follicle center B-cell lymphoma with spindle cells.Although this rare variant of primary cutaneous B-cell lymphoma is not included in the recent WHO-EORTC classification, the rarity of this tumor and its unique morphologic appearance frequently leads to misdiagnosis and delays its treatment.
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