Quadriceps tendon partial tear
History of fall on the left side with left knee swelling and tenderness.
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There is a partial tear of the quadriceps tendon involving the anterolateral fibers at its patellar insertion. There are anterior soft tissue swelling and fluid collection of intermediate signal on T1-weighted images and high signal on T2-weighted images suggesting hematoma.
The ACL, PCL, collateral ligaments, patellar retinaculum, and patellar tendon appear intact. The medial and lateral menisci appear normal without evidence of meniscal tear. The osseous texture is normal with no evidence of fracture. The surrounding muscles show no abnormalities. There is a moderate joint effusion.
The findings are consistent with a quadriceps tendon partial tear.