20-year-old female with cramps. Rule out fatty replacement thigh muscle, myopathy. The muscles of the right thigh appear normal without evidence of fatty atrophy or edema. We see no abnormal enhancement. The remaining soft tissues of the right thigh appear normal. Marrow signal intensity of the right femur appears normal.On the large field-of-view coronal images there is an intramedullary lesion centrally within the mid left femoral diaphysis. It measures approximately 7 cm in craniocaudal dimension and approximately 1.5 cm in greatest transverse dimension and results in mild endosteal scalloping and perhaps mild cortical thickening. It has a lobulated margin. It is predominantly isointense to muscle on T1-weighted images, heterogeneously hyperintense on T2-weighted images and shows peripheral and somewhat lobular enhancement on postcontrast images
1.Normal appearance of the right thigh musculature without evidence of fatty atrophy or myositis.2.Intramedullary lesion of the left femoral diaphysis as described above that we suspect represents a benign enchondroma. However dedicated femur radiographs are strongly recommended for confirmation.