Reason: 69 y/o female with DLCBL and lucency right femur head and neck on XRAy and PET. Is NOT FDG avid on PET. Looks like fatty deposit per radiology, Need MRI to characterize History: right femur lucency Note is made of heterogeneous bone marrow signal abnormality which may represent residual islands of red marrow. Note is made of heterogeneous marrow signal abnormality corresponding to findings seen on recent CT examination and hip radiographs which is iso to hyperintense to skeletal muscle on T1-weighted images, slightly hyperintense on fluid sensitive sequences and demonstrates no definite enhancement on postcontrast sequences. There is a subcentimeter focus of increased bone marrow signal abnormality within the left sacral wing which is nonspecific and too small to characterize. There is nonspecific subcutaneous edema along the lateral aspect of the right hip. There is a small amount of fluid within the hip joints bilaterally which is not necessarily of any clinical significance. Mild osteoarthritis affects the hips.
Lesion within the right femoral head/neck corresponding to the findings seen on recent PET/CT examination and radiographs without definite enhancement. These findings appear most consistent with a benign fibrous lesion including fibrous dysplasia or perhaps a liposclerosing myxofibrous tumor, with an intraosseous lipoma also is a differential consideration. A lymphomatous deposit is considered exceedingly unlikely given the imaging characteristics, lack of definite enhancement, and lack of hypermetabolic activity on the recent PET/CT examination.