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MRI is excellent for looking at scar tissue. MRI is able to distinguish between scar tissue and recurrent tumors. Therefore, breast MRI can evaluate a significant change in the lumpectomy site. It can determine how much cancer has spread beyond the surgical site after a breast biopsy or lumpectomy.
Other MRI. An MRI can also be used to diagnose a pinched nerve in other areas of the body, such as the wrist. The MRI will typically show a swollen tendon or ligament pressing on the nerve.omstock/Comstock/Getty Images. A magnetic resonance imaging (MRI) is a noninvasive test that is used to help physicians diagnose problems within the body. A common use for the MRI is to locate and diagnose a pinched nerve. The MRI provides a clear and detailed image of the internal body structures.