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Primary Cutaneous Anaplastic Lymphoma Kinase-Positive Large B-Cell Lymphoma.
American Journal of Dermatopathology 2019 January 4
Large B-cell lymphomas include several subtypes. Recently, anaplastic lymphoma kinase (ALK)-positive large B-cell lymphoma has been delineated as a distinct entity involving mostly lymph nodes and rarely affecting extranodal sites. We describe the first case of a primary cutaneous ALK-positive large B-cell lymphoma in a 48-year-old man with a solitary nodule on the back, and describe the histologic and phenotypic features. Accurate staging confirmed the absence of other lesions, and so surgical excision and postoperative local radiation therapy were initiated and resulted in complete remission. Two years later, extracutaneous spread with involvement of axillary lymph nodes occurred. Complete remission was achieved again by multiagent chemotherapy. Our case demonstrates that a primary cutaneous form of ALK-positive large B-cell lymphoma exists. The immunophenotypic analysis of cutaneous large B-cell lymphomas affecting the skin primarily or secondarily should include the assessment of ALK expression.
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