Magnetic resonance imaging of acute hamstring tear

The T2 weighted images are from a 22-year-old professional baseball player who complained of acute pain in the posteromedial aspect of his knee. Image A is an axial section just above the knee joint and shows a fluid collection (arrow) with an absent semitendinosus tendon. The region of interest is magnified in image B. Image C is taken slightly more cephalad and reveals the low intensity retracted and torn semitendinosus tendon (arrowhead), detached from the tibial insertion. Image D is a magnified view.