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. 2001 Apr;22(4):786–794.

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fig 8. — Sarcoid.

A, Axial T1-weighted spin-echo unenhanced image (600/9/2), obtained through the proximal right thigh, reveals an isointense (to muscle) mass (white arrow), centered within the sciatic nerve tibial division that distorts the adjacent peroneal division (black arrow).

B, Contrast-enhanced axial-view T1-weighted spin-echo image (550/14/2) confirms moderate enhancement of the mass after the administration of contrast medium (white arrow). The adjacent peroneal division does not enhance (black arrow). There is homogeneous loss of normal fascicular architecture within the mass on both the unenhanced and contrast-enhanced images.

C, Axial fast spin-echo inversion recovery image (5000/45/150; echo train length, 8) confirms a mildly hyperintense mass within the tibial division that enlarges the sciatic nerve and obscures normal fascicular architecture. There is also marked fascicular hyperintensity of the adjacent peroneal division (black arrow), reflecting the compressive neuropraxic injury.