Young man with NF1 and odd tumor of the right calf. Please define borders of tumor on right calf. It is purely superficial. There is a mass within the subcutaneous fat of the leg situated medial to the proximal tibial diaphysis. It is approximately 4.7 x 4.2 cm in transverse dimension and approximately 8.1 cm in craniocaudal dimension. I suspect that it abuts the peripheral deep fascia, however there is no invasion of the underlying musculature. The mass is homogeneously isointense to skeletal muscle on T1-weighted images. It is predominantly of increased signal intensity on T2-weighted images with relatively ow signal intensity foci centrally within the mass - findings are that are compatible with a nerve sheath tumor.A mass of similar signal intensity characteristics is noted between the medial and lateral heads of the gastrocnemius posterior to the distal femur; however it is not included in its entirety on the field-of-view of this tibia/fibula study. Several additional smaller cutaneous/subcutaneous foci of signal abnormality are noted presumably representing additional nerve sheath tumors. A string of nerve sheath tumors is noted adjacent to the proximal fibula extending into the peroneal musculature. A few small nerve sheath tumors are also noted affecting the left leg as seen on the large field-of-view images.
Nerve sheath tumors as described above.