Muscle Injury
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IMAGING
General Features
Ultrasonographic Findings
Typically associated with grade 2 or 3 tears
Appearance varies with duration, severity, and location of hematoma
During first 48 hours, initially hypoechoic then becomes more hyperechoic as hematoma solidifies
After 72 hours, hematoma can start to liquefy
Marginal hyperemia during reparative phase (reparative fibrovascular granulation tissue)
Imaging Recommendations
at the distal end of the medial belly of gastrocnemius muscle. This is the most common site of calf muscle tears.
with more intense, gravity-related bruising at the ankle region 
.
at the distal end of the medial belly of gastrocnemius muscle. The medium-severity tear is filled with fluid. No muscle retraction is present.
. Overall, ~ 15% of the cross-sectional area (CSA) of the muscle insertion is torn. The plantaris tendon 
is normal.
