Femur/Thigh MRI is often used in the evaluation of both post-traumatic and chronic thigh pain. MRI can detect occult fractures including stress or inefficiency fractures, muscle or ligament tears and major nerve abnormalities. In cases of thigh soft tissue masses, intravenous contrast is often given to differentiate between solid masses and cysts. MRI is also used in the evaluation of bone lesions . detected on X-ray and CT. MRI can help differentiate between aggressive bone lesions, such as malignancy or infection, and more benign lesions, such as benign tumors or congenital abnormalities.