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There are fluid collections involving vastus lateralis muscle ( about 40 x 25 x 10 mm ) and vastus intermedius muscle ( about 35 x 20 x 9 mm ) at myotendinous junction regions due to the muscle fibers tear. However, there is no tear of the aponeurosis. Rectus femoris and vastus medialis muscles are normal. The quadriceps tendon is intact. There is no suprapatellar effusion. There is mild edema of overlying subcutaneous fat.
The asymptomatic right side shows normal muscle echopattern.