Inconstant bursae between adjacent hamstring muscle bellies (biceps femoris long head, semimembranosus, semitendinosus) at the mid-thigh level, reducing inter-muscular friction during rapid knee flexion and hip extension.
Hamstring mid-belly bursitis is rare and usually post-traumatic, following a direct posterior thigh blow or a muscle tear with associated haematoma. It presents as a firm, non-pulsatile posterior thigh mass that may mimic a soft tissue tumour. MRI distinguishes bursitis from a haematoma by the thin-walled, fluid-signal characteristic. Aspiration is curative.
Bursal fluid collection between hamstring bellies following a direct posterior thigh contusion, presenting as a soft tissue mass requiring MRI to distinguish from haematoma or soft tissue sarcoma.
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