Hypothenar Hammer Syndrome due to Repeated Trauma in an Anesthetist when Opening Cylinder Valve

Hypothenar hammer syndrome (HHS) is a rare vascular disorder resulting from repeated trauma to the hypothenar region, leading to ulnar artery injury, thrombosis, or pseudoaneurysm formation. While typically associated with manual laborers, occupational exposure in anesthetists is seldom reported. We present the case of a 68-year-old male anesthetist who developed pain, swelling, and numbness over the hypothenar eminence following repetitive trauma when opening oxygen cylinders at work. Clinical examination revealed tenderness and a subtle pulsatile mass. Doppler ultrasonography and computed tomography angiography confirmed a pseudoaneurysm of the distal ulnar artery. The patient underwent surgical excision of the pseudoaneurysm with primary repair of the ulnar artery. Postoperative recovery was uneventful, with complete resolution of symptoms and restoration of hand function at 3-month follow-up. This case highlights the risk of HHS in anesthetists due to repeated occupational trauma and underscores the importance of early recognition, appropriate imaging, and timely surgical management to prevent permanent vascular or neurological complications.