Large left flank/sacral mass in girl with NF1. There is a partly imaged large mass in the left paraspinal region with a bag of worms appearance, which extends from the L1 level to the sacrococcygeal region. The tumor protrudes into the left L1-2 through S2-3 neural foramina, but does not enter the spinal canal. There is also an infiltrative mass with partial bag of worms appearance in the posterior lower back subcutaneous tissues that measures up to approximately 11.5 cm. There is scalloping of multiple lumbar and sacral vertebral bodies with widening of the spinal canal. There is exaggerated lumbar lordosis, but no spondylolisthesis. The imaged cauda equina nerve roots and spinal cord appear to be grossly unremarkable.
1. A partly imaged large mass in the left paraspinal region with a bag of worms appearance, which extends from the L1 level to the sacrococcygeal region likely represents a plexiform neurofibroma, although assessment is limited by the lack of contrast. The tumor protrudes into the left L1-2 through S2-3 neural foramina, but does not enter the spinal canal. Please refer to the separate pelvis MRI report for additional details.2. An infiltrative mass in the posterior lower back subcutaneous tissues that measures up to approximately 11.5 cm may represent a superficial neurofibroma combined with features of a plexiform neurofibroma.3. Multilevel posterior vertebral scalloping related to neurofibromatosis 1.