MRI: Ultrasound has a problem distinguishing one soft tissue (like muscle) from another (like nerves or tendons or fat or skin). So the cremaster muscle is hard to see on US. A (fat-saturated T2 inversion recovery or fat-sat IR) MRI scan stands a better chance of distinguishing the muscle from other types of tissues in the groin. A CT scan has a chance, but it involves radiation, which is best avoided.
Answered 11/9/2015
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