27-year-old female with NF1 who has pain that radiates into right hand, mainly middle two fingers. Also largish cutaneous neurofibroma at ulnar border. Multiple lesions are present located in the superficial cutaneous tissues which demonstrate low T1, bright T2/STIR and heterogeneous enhancement after contrast administration most compatible with neurofibromas. The largest is located within the dorsal soft tissues of the distal forearm measuring 14 mm (anteroposterior) x 24 mm (mediolateral) by x 25 mm (craniocaudal). Additional lesions are located more deeply within the volar soft tissues of the distal forearm along the coarse of the ulnar and median nerves; the largest in the ulnar nerve distally near the carpal tunnel measures 8 mm (anteroposterior) x 5 mm (mediolateral) x 14 mm (craniocaudal). The largest in the median nerve measures 7 mm (mediolateral) x 6 mm (anteroposterior) overlying the distal humeral diaphysis. Additional subcentimeter lesions appear to occupy the posterior interosseous nerve overlying the mid to distal humeral diaphysis (series 1101, image 48).The tendons and muscles of the forearm appear normal. Bone marrow signal intensity is normal.
Multiple neurofibromas along the forearm, the largest of which occupy the superficial cutaneous tissues, with additional smaller lesions affecting the ulnar, median and posterior interosseous nerve as described above.