PMC3589844_01
Foot asymmetry is evident, along with dorsal calluses (arrow) on affected left foot
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F1
The corresponding toes were noted to have nonpainful dorsal calluses [Figure 1].
Precontrast (left) and postcontrast (right) axial T1-weighted magnetic resonance images of the lower extremity demonstrate the presence of a well-circumscribed, mildly heterogeneously enhancing mass in the location of the right sciatic nerve (arrows)
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F2
The tumor appeared hypointense on T2-weighted images, isointense-to-hypointense signal on the T1-weighted image with mild heterogeneous internal enhancement in a longitudinal orientation after administration of gadolinium contrast [Figure 2].
Intraoperative photograph at open biopsy showing the hypertrophic, firm, and bulbous sciatic nerve
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F3
The whole sciatic nerve appeared involved and was notably hypertrophic, firm, and bulbous [Figure 3].
Photomicrograph: Neuromuscular choristoma showing skeletal muscle mixed with nerve fibers (H and E, magnification x200)
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F4
Within the specimen, small nerve bundles and axons were seen intermixed with adjacent mature striated skeletal muscle bundles, surrounded by a dense collagenous matrix [Figure 4].