Aggressive angiomyxoma of the pelvis and perineum. Report of a case with immunohistochemical and electron microscopic study.

A case of aggressive angiomyxoma (AAM) of the pelvis and perineum is reported, whose clinical and pathological findings are consistent with the literature. This is a clinicopathological entity recently described by Rosai and colleagues (1983) who stressed its locally infiltrative nature and its tendency to recur. Its differential diagnosis includes a series of benign and malignant soft tissue tumours.