Hypothenar Hammer Syndrome in an Elderly Caucasian Female: A Case Report.

Hypothenar hammer syndrome (HHS) is a vascular disorder characterized by ulnar artery thrombosis or aneurysmal formation. It is most commonly reported in middle-aged males who suffer from repetitive trauma to the palm secondary to occupational or recreational activities. Most cases of HHS can be managed conservatively; however, surgical management is typically indicated for persistent symptoms following conservative measures, imminent vascular compromise, those who fail conservative treatment, or those in imminent danger of rupture. Here we present the case of a right-handed 74-year-old female with HHS who presented with a three-week history of a mass in the hypothenar eminence of the left hand. Reportedly, the mass had appeared slowly and had no associated pain, ischemia of the distal hand, numbness, paresthesia, or changes in the overlying skin. She denied any history of a blunt or penetrating hand injury. The patient was treated surgically by removing a 2.0-cm thrombosed pseudoaneurysm of a collateral branch of the ulnar artery within the left hypothenar eminence. On follow-ups at 1, 2, and 12 weeks postoperatively, the patient's pain was found to be well-controlled. Her normal range of motion was restored, and her digits remained neurovascularly intact. This was an atypical presentation of HHS, and our review of the disorder emphasizes the importance of diagnostic reasoning in rare conditions with unusual presentations of HHS.