Most common sarcoma of paratesticular tissue in adults (followed by leiomyosarcoma).
Bulky paratesticular/testicular mass with yellow fatty appearance.
Most often lipoma-like or well-differentiated liposarcoma. (Identifiable neoplastic fat cells are abundant) (image A).
Contain lipoblasts (large multivacuolated cell with pleomorphic nuclei and the nucleus is indented by the vacoulations) (image B).
Rarely may undergo high-grade dedifferentiation to spindle cell morphology.
Has prolonged clinical course with recurrences in >50%.
No metastasis in well-differentiated tumors.