40-year-old male with a history of neurofibromatosis type I, evaluate margins of neurofibromas deep within the buttocks. Several sequences are limited by patient motion artifact.There are several subcutaneous masses overlying the gluteus maximus compatible with small nerve sheath tumors appearing similar to those seen on the prior study. No large tumor along the expected course of the proximal sciatic nerve or elsewhere deep within the buttocks.Small nerve sheath tumors are noted along the right S3 and S4 nerve roots appearing similar to the prior study. There are tiny nerve sheath tumors anteriorly and within the pelvis.There is mild poorly-defined edema type signal within the lateral portion of the gluteus maximus muscle at the level of the proximal femur. The signal is nonspecific and could represent a mild strain. Of note, a similar finding was present in retrospect on the prior study.Bone marrow signal intensity is normal. Mild osteoarthritis affects both hips with what appears to be bilateral CAM deformities. Mild signal abnormality in the acetabular labra bilaterally, which may reflect tearing. The hamstring tendons appear normal.
1. Multiple small nerve sheath tumors compatible with patient's stated diagnosis of neurofibromatosis type I. However, no dominant deep buttock lesion is identified.2. Mild edema type signal within the gluteus maximus laterally, as described above, is nonspecific and could represent a strain. However, similar findings were present on the prior study.3. Other findings as described above.