[A left axillary synovial sarcoma--a case report].

: A case of a synovial sarcoma arising in left axillary portion is reported. The structure of the tumor proved to be predominantly monophagic, through, immunohistochemically, the epithelial membrane antigen, keratin, and vimentin stained positively in the tumor cells in varying degrees. Electron microscopic observation revealed that some tumor cells were arranged in gland-like structures, with a desmosome-like attachment and fine microvilli in the luminal area.