Hematoma

Sonography can depict both muscle contusion and hematoma. Sonographi-cally, a contusion is seen as an ill-defined area of hyperechogenicity in the muscle, which may cross fascial planes. In contrast, a hematoma appears as a hypoechoic fluid collection, and may contain debris (Fig. 15) [39]. Sonogra-phy can also provide guidance for aspiration of a painful hematoma.

Achilles Musculotendinous JunctionAchilles Musculotendinous Junction
Fig. 14. Partial tear of the rectus femoris. (A, B) Two longitudinal images of the rectus femoris show hypoechoic areas within the musculotendinous junction (A, notched arrows) as well as within the muscle fibers.

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