Malignant peripheral nerve sheath tumor in an elderly patient with superficial spreading melanoma: A case report

Figure 3 Magnetic resonance images of the malignant peripheral nerve sheath tumor. A: The sagittal T1-weighted images of the left knee showed a heterogeneously hypointense mass (orange arrows), with an irregular shape, clear boundary, internal lobules and the absence of a visible entering or exiting nerve; B: The lesion (white arrows) showed heterogeneous hypointensity on the fat-saturated T2-weighted images and the hyperintense grid-like fascia (orange arrows) suggested peritumoral edema; C and D: The lesion with thickened skin (orange arrows) also showed heterogeneous enhancement with non-enhanced focal areas (orange arrowheads) on contrast-enhanced T1-weighted images in the sagittal and coronal plane.