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) . Sonogra-phy can also provide guidance for aspiration of a painful hematoma.
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