Malignant mesenchymoma of spermatic cord: a case report with intermediate filament typing.

A malignant mesenchymoma arising in the spermatic cord of a 79-year-old patient is described. The radiologic appearance was that of a predominantly calcified mass. Histologically the tumor was composed primarily of malignant cartilage. In other areas there were spindle-shaped cells and large eosinophilic and multinucleated giant cells. Staining for intermediate filaments revealed vimentin throughout the neoplasm with some areas showing positive staining for desmin, the latter confirming the muscular origin of some of the neoplastic elements. No cytokeratins were identified, effectively ruling out the possibility of a malignant teratoma.