"A side strain injury can be detected on ultrasound by hypoechoic or anechoic gaps at the costal or chondral attachment site and a loss of the normal fibrillar pattern. In addition, hypoechoic or anechoic areas may be found between the internal and external oblique muscles reflecting haemorrhage 2."
"Side strain injuries can be graded into partial or complete tears. Partial tears can appear as feathery fluid-like signal intensity on fat-saturated T2 weighted or intermediate weighted images as well as fluid tracking between the myofibrils. A complete tear can be assumed when a discontinuity of the fibres is present along the proximal muscle fibres or a detachment at their costal or costochondral insertion site 1."
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"Mechanism"
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"A side strain injury can be detected on ultrasound by hypoechoic or anechoic gaps at the costal or chondral attachment site and a loss of the normal fibrillar pattern. In addition, hypoechoic or anechoic areas may be found between the internal and external oblique muscles reflecting haemorrhage 2."