Metastatic nasopharyngeal carcinoma: cytologic features of 18 cases.

The cytologic features of 18 fine-needle aspirates (FNAs) of metastatic nasopharyngeal carcinoma from 17 patients were examined. The 12 males and 5 females had a median age of 45 years (range 17-75 years). Six were white, five Oriental, four Hispanic, and two black. All patients had mid- or upper-cervical lymphadenopathy (14 bilateral, 3 unilateral). Seven developed widespread metastasis (bone, 5; lung, 2; liver 1; adrenal, 1; soft tissue, 1). The FNAs were from cervical lymph nodes (15), liver (1), adrenal (1), and soft tissue (1). Most aspirates showed similar cytologic features. Tumor cells were present singly and in syncytial groups with overlapping moderately pleomorphic oval to spindle-shaped nuclei with thin, slightly irregular nuclear contours, moderately hyperchromatic chromatin, and usually one or two prominent nucleoli. The cytoplasm was scant and pale with ill-defined borders. Mitoses were frequent. Mature lymphocytes were common in the background of lymph node aspirates. Electron microscopy and immunocytochemistry confirmed the epithelial nature of the tumor in four cases. Although the cytologic features of metastatic nasopharyngeal carcinoma (NPC) are characteristic, other poorly differentiated neoplasms need to be considered. Clinical and radiologic data are helpful in supporting the cytologic diagnosis.