Fig. 1. (A) Sagittal T2-weighted magnetic resonance imaging (MRI) shows well-defined hyperintense cystic mass consistent with ganglion overlying the proximal radius. (B) Axial T2-weighted MRI shows well-defined hyperintense cystic mass consistent with ganglion overlying the proximal radius (arrow: ganglion stalk). (C) Two serial axial T1-weighted MRI images show posterior interosseous nerve (PIN) compression by ganglion (arrows: PIN, solid lines: ganglion cyst, arrowheads: supinator muscle).
Fig. 2. (A) Brachioradialis is retracted with ragnell retractor and common extensors are retracted with Volkmann retractor (4 prong) (arrow: Arcade of Frohse, solid line: posterior interosseous nerve under the cyst, arrowhead: direction of stalk). (B) Ganglion cyst was excised at the base of the stalk of the cyst which seemed to be connected to the proximal radioulnar joint capsule.
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