Proximal femur lesion. Centered within the anterior cortex of the proximal femoral diaphysis is a lucent lesion with internal septations. The lesion measures 8 mm x 12 mm in maximal axial dimensions, and approximately 2.2 cm in maximal craniocaudal dimensions. The lesion does not appear to contain internal fat, or chondroid matrix. A small portion of the lesion appears to extend beyond the cortex of the femur, and into the quadriceps musculature as demonstrated on outside MRI. This is seen for example on series 5, image 48. There are no enhancing components of this lesion. The lesion does not extend into the medullary cavity. Surrounding soft tissues are otherwise normal.The right hip joint is grossly normal.There is normal intravascular enhancement.Muscles and soft tissues are otherwise normal. No fractures.
Lucent lesion with sclerotic borders and internal septation centered within the anterior cortex of the proximal right femoral diaphysis as above, with a component apparently extending beyond the cortex. Nonossifying fibroma is suspected, but this is nonspecific. Although this lesion has some imaging characteristics of a chondromyxoid fibroma, osteofibrous dysplasia or an adamantinoma, the location of this lesion within the femoral diaphysis makes these differential possibilities less likely. Additionally, chronic infection is disfavored. 