Diagnosis and excision of an ulnar artery aneurysm in a two-year-old boy.

Ulnar artery aneurysms in children younger than 10 years of age are rare, with fewer than 10 reported cases worldwide. Unlike adult arterial aneurysms, the etiology of these lesions in children is not well understood, and there is no accepted method for treating these lesions. The method of diagnosis and excision of an ulnar artery aneurysm that showed a favourable outcome in a two-year-old boy is presented. Different approaches to treating similar lesions have been reported, and these approaches are briefly reviewed.