KI-1-POSITIVE ANAPLASTIC LARGE-CELL LYMPHOMA INITIALLY DIAGNOSED AS HODGKINS-DISEASE BY FINE-NEEDLE ASPIRATION (FNA) CYTOLOGY

A 45-year-old male presented with a large mass in the left axilla. FNA cytology was interpreted as Hodgkin's disease (HD), lymphocyte deplet ion (LD) type, but histopathologic and immunohistochemical examination showed features of Ki-1-positive anaplastic large cell lymphoma. Unre presentative sampling by the FNA from the tumour periphery resulted in a false impression of dual reactive and neoplastic cell populations, which together with the frequent Reed-Sternberg-like cells led to the initial erroneous impression of HD. Therefore, the cytologic diagnosis of HD, LD should be approached with caution.