Vastus lateralis muscle tear
Trauma to lateral distal aspect of thigh - Few wks. Local swelling. Referred for local swelling USG.
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There is anechoic lesion in subcutaneous plane of distal - lateral aspect of thigh .
Echoes are noted within. Lesion is compressible. Well-defined thin capsule ( < 2 mm ) is noted around lesion. No flow is noted in wall.
Perilesional fat is echogenic with increased vascularity.
A mobile echogenic nodule is noted within - probably fat lobule.
Size : Cranio-caudal - 50 mm ; Transverse - 55mm ; Thickness - 10 mm.
Vastus lateralis shows defect deep to above mentioned subcutanous collection - tear at myotendinous junction.
Full thickness defect is in lateral most fibres.
Defect size - 33 x 33 mm.
Retraction - 18 mm.
Hypervascularity is noted at both ends.