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Figure 6b. Bilateral plexiform neurofibromas of the lumbosacral plexus in a 25-year-old man with a family history of NF1. He presented to the emergency department complaining of abdominal pain following a motor vehicle accident. Intravenous contrast-enhanced CT scans show bilateral psoas masses. The mass on the right is large, lobular, and hypoattenuating with patchy contrast enhancement. It enlarges and extends into the adjacent neural foramen (arrow in a). Multiple branches of the inferior right lumbosacral plexus (arrowheads) are involved, including the femoral nerve adjacent to the external iliac vessels. The lower sacral foramina (curved arrow in c) are enlarged bilaterally.
