Benign vaginal rhabdomyoma.

A case of benign polypoid vaginal rhabdomyoma occurring in a 52-year-old female is described. The characteristic histological features were interlacing bands of striated muscle cells with prominent cross and longitudinal striations, with surrounding loose collagenous stroma, within which were many dilated vascular spaces. Electron microscopy confirmed the striated muscle origin of these cells. The pathogenesis is possibly a localized area of abnormal mesenchymal differentiation.