PMC3241826_01
Sagittal T1-weighted MR image (A) of the lower leg demonstrating several benign schwannomas with homogeneously decreased T1 signal (arrows). More proximally, there was a larger lesion with heterogenous T1 signal, representing the biopsy proven epithelioid malignant peripheral nerve sheath tumor (arrowhead). Axial T1-weighted MR image (B) established the anatomic continuity of the malignant peripheral nerve sheath tumor with the traversing segment of the superficial peroneal nerve. Coronal T2-weighted fat-suppressed MR image of the right upper extremity above the elbow (C) demonstrating two benign schwannomas in continuity with the traversing segment of the ulnar nerve (arrows).
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F1
The largest mass measured 6.7 cm and demonstrated heterogeneous internal signal on T1-weighted imaging with mixed areas of isointense and hyperintense signal compared to skeletal muscle (Figure 1A,1B). Further MR imaging of the right upper extremity above the elbow, demonstrated additional masses associated with the right ulnar nerve (Figure 1C).
PMC3241826_02