MRI demonstrating an MPNST in a patient without neurofibromatosis. (A) T2 imaging shows tumor (arrows) with inhomogeneous signal intensity with areas of high, intermediate and low signal in a large mass. (B) T1 image of the same tumor exhibiting signal intensity similar to muscle. (C) T1 imaging of the same tumor in an axial view (arrow). (D) T1 postgadolinium showing minimal and somewhat irregular enhancement.
MRI: magnetic resonance imaging; MPNST: malignant peripheral nerve sheath tumor.
