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The palpable lump was examined, revealing a 5 x 3 mm hypoechoic soft tissue mass inferolateral to the patella. This reduced on knee extension, through a 3 mm defect in the lateral patellar retinaculum. Anteriorly, the iliotibial band was intact to Gerdy's tubercle; posteriorly the lateral collateral ligament was intact to the fibular styloid.