Intraosseous Ganglion Protruding Into the Spinoglenoid Notch With Suprascapular Nerve Entrapment: A Case Report.

Suprascapular nerve entrapment caused by intraosseous cystic lesions is a rare condition. We present the case of a 49-year-old man with right shoulder numbness, slight infraspinatus (ISP) weakness, and shoulder pain. He underwent open surgery and arthroscopic evaluation. The cystic lesion, histologically diagnosed as a ganglion, was resected, and the bony defect was filled with artificial bone. Immediately after the operation, the shoulder numbness and muscle weakness resolved. At the one-year follow-up, the patient's right shoulder pain disappeared, and he had excellent clinical results. An intraosseous cyst protruding into the spinoglenoid notch, causing suprascapular nerve entrapment, might elicit neurological symptoms and glenoid fracture. However, the treatment and clinical course of this condition are still unknown. This case suggests that patients treated with tumor resection and bone grafting to the bony defect in this abnormality may have favorable outcomes.