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Figure 7a.   Nerve sheath ganglion in a 25-year-old man with peroneal nerve distribution symptoms. (a, b) Axial T1-weighted (600/20) (a) and fat-suppressed T2-weighted (4,666/90) (b) MR images show a fluid-appearing mass (arrowheads) adjacent to the anterolateral proximal fibula and peroneal nerve (arrow). (c, d) Intraoperative photograph (c) and photograph of the sectioned gross specimen (d) show gelatinous and myxoid consistency (*), septations (straight arrows), and the fibrous wall of the ganglion (curved arrows).