We describe the case of a 59-year-old woman with Ki-1-negative, T cell-type, anaplastic lymphoma kinase (ALK)-positive large cell lymphoma that was positive for epithelial membrane antigen. She was histopathologically diagnosed as having a metastatic undifferentiated carcinoma from a cervical lymph node biopsy. Clinical and radiographic studies revealed no other primary tumor. The patient underwent a left radical neck dissection. Surgically resected lymph nodes revealed an ALK1-positive large cell lymphoma. Thereafter the patient has had an unusually favorable prognosis.
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