Rapidly expanding ulnar false aneurysm related to a tablet computer.

Aneurysms of the ulnar artery are rare, usually related to the hypothenar hammer syndrome and caused by repetitive blunt trauma over the hook of the hamate bone. However, rapidly expanding ulnar false aneurysms are extremely rare, and nearly all are caused by a penetrating injury. We report a singular case of rapidly expanding pseudoaneurysm caused by the repetitive use of the hypothenar eminence as the supporting point of a tablet computer. This tablet model has a notch on its posterior side that played an essential role in the pathogenesis. This report illustrate that even low-intensity trauma can be an exceptional cause of injury to the palmar portion of the ulnar artery, and subsequently, can lead to the development of these lesions. The false aneurysm was repaired by means of resection and reconstruction by an end-to-end anastomosis because a rapid diagnosis and surgical treatment can prevent further complications.