Dorsal wrist ganglion originating at the volar scaphotrapeziotrapezoidal joint: a case report

Ganglion cysts originating from the volar wrist joint are usually found on the volar side. A case report has described a patient with a dorsal wrist ganglion originating from the scapholunate ligament and appearing at a volar location. However, no cases of volar wrist ganglia appearing on the dorsal wrist have been reported. Herein, we present a rare case of a large dorsal ganglion cyst originating from the volar scaphotrapeziotrapezoidal (STT) joint that pierced the first dorsal interosseous muscle, leading to dorsal bulging. A 40-year-old woman presented with a progressively growing mass over the dorsal aspect of her left wrist and mild pain. Preoperative imaging showed a ganglion cyst originating from the volar side of the STT joint. The ganglion was successfully removed through open surgery. In conclusion, since ganglion cysts occurring in the dorsal wrist, especially if there is deviation to the radial side, may originate from the volar midcarpal joint, magnetic resonance imaging is necessary to reduce the risk of recurrence and minimize the likelihood of postoperative complications.