Pitcher's disease: A case of brain fog, arm weakness, numbness, and tingling.

Thoracic outlet syndrome (TOS) is a rare condition caused by compression of the lower trunk of the brachial plexus and/or subclavian vessels. This case report describes the presentation of a 56-year-old right-handed baseball pitcher who presented with 1 year of right arm pain, finger tingling, heaviness, and brain fog. A vascular duplex ultrasound guidance and functional maneuvers showed evidence of venous and neurogenic TOS. The patient was successfully treated with a first rib resection, substantially improving right arm symptoms and brain fog. This case highlights a correlation between nonspecific cognitive dysfunction and TOS, which is seldom reported in existing literature.