We describe cytogenetic findings in a poorly differentiated, metastatic mucoepidermoid carcinoma of the parotid gland. The tumor was characterized by multiple, unrelated chromosome abnormalities. Except for two small aberrant clones showing t(1;7) and t(2;15), respectively, all other abnormal cells showed unique, mostly structural rearrangements peculiar to each cell. No less than 34 different abnormal karyotypes were observed. A similar karyotypic heterogeneity was also described recently in squamous cell carcinomas of the head and neck.