Reason: please define the margins of the tumor History: woman with NF1 and largish plexiform neurofibroma of left hip/flank (just above or at the iliac crest) BONE MARROW: No fractures are identified. Bone marrow signal is within normal limits.SOFT TISSUES: There is a soft tissue mass mass in the left back centered just above the iliac crest (series 401, image 35) which measures approximately 6.5 x 11.1 cm in the axial plane and 4.5 cm in the craniocaudal dimension. The lesion is somewhat heterogeneous and demonstrates increased T2 signal and decreased T1 signal compared to the adjacent fat. The deep margin of the lesion is somewhat indistinct and blends with the underlying fat. The lesion appears separate from the adjacent deep paraspinal and gluteal muscles; the intervening fat planes appear intact. Additional scattered round targetoid T2 hyperintense lesions are present throughout the soft tissues of the abdomen, pelvis and bilateral lower extremities compatible with neurofibromas. An example lesion in the anterior musculature of the right thigh (image 401, image 4) measures approximately 1.3 x 1.8 cm. JOINTS: No significant abnormality noted.ADDITIONAL
1.Soft tissue mass in the left back centered just above the iliac crest measuring 6.5 x 11.1 x 4.5 with features somewhat atypical for classic neurofibroma and which could represent a malignant peripheral nerve sheath tumor. 2.Additional smaller neurofibromas scattered throughout the soft tissues of the abdomen, pelvis and bilateral lower extremities.