35-year-old male with subcutaneous masses in the left forearm and history of NF1. Evaluate for subcutaneous NF involvement with ulnar nerve. Note is made of a 2.1 x 1.2 x 2.0 cm mass within the subcutaneous tissues along the anterior aspect of the left forearm at the level of the distal ulnar diaphysis. There is associated increased signal abnormality on fluid sensitive sequences and slight enhancement following contrast administration. There are some foci of decreased signal abnormality on T2-weighted images centrally. This finding likely represents a neurofibroma. There is no extension to involve the underlying musculature. There is an additional mass within the subcutaneous tissue along the medial aspect of the left forearm at the level of the proximal diaphysis of the ulna which abuts the fascia along the flexor musculature and measures 2.7 x 0.8 cm and also demonstrates increased signal abnormality on fluid sensitive sequences and minimal enhancement following contrast administration. There is an associated internal septation and foci of decreased signal abnormality on T2-weighted images internally.
Multiple subcutaneous masses along the anterior and medial aspect of the left forearm as described above which likely represent neurofibromas. 