Reason: any evidence of a neurofibroma? History: woman with pain in left triceps who has neurofibromatosis type 1 Note is made of numerous cutaneous and subcutaneous foci of increased signal abnormality on fluid sensitive sequences which likely represent cutaneous neurofibromas. There is a 1.4 x 0.8 cm focus of increased signal intensity along the anterior aspect of the pectoralis major muscle which likely represents a neurofibroma. There is associated decrease signal abnormality centrally within this lesion. More inferiorly, within the medial head of the triceps is a 4.0 x 3.7 x 6.6 (AP x TR x CC) cm mass which demonstrates heterogeneous but predominantly increased signal intensity on fluid sensitive sequences with low signal intensity centrally, also likely representing an neurofibroma, although the possibility of a malignant peripheral nerve sheath tumor cannot be completely excluded. Note is made of prominent axillary lymph nodes which retain the normal fatty hilum. No bone marrow signal abnormality is identified. The imaged musculature of the left arm is otherwise normal in appearance
Findings consistent with the patient's history of neurofibromatosis as described above. There is a 6.6 cm mass within the medial head of the triceps musculature that likely represents a neurofibroma, however, the possibility of a malignant peripheral nerve sheath tumor cannot be completely excluded by this examination.