Imaging of semimembranosus bursitis: MR findings in three patients and anatomical study.

We report on three patients with posteromedial knee pain related to semimembranosus bursitis. The semimembranosus bursa has a typical location and morphology around the central tendon of the semimembranosus muscle. These characteristics are demonstrated in patients and by dissection of the tendon and bursa in an embalmed knee specimen.