A true posterior tibial artery aneurysm--a case report.

Aneurysms of infrapopliteal arteries are rare. The etiology is usually traumatic, and most aneurysms are false. The English-language literature reports only 33 cases of infrapopliteal arterial true aneurysms, of which 8 involve the posterior tibial artery. The etiology of these lesions is unclear; a fibromuscular fibrodysplasia similar to ulnar aneurysm may be hypothesized, but traumatic, atherosclerotic, inflammatory, and other pathological processes are also probably involved. The natural history seems to be related to thrombosis and distal embolism more than to rupture. Surgical indications are debated. Aneurysm repair with a complete restoration of the blood flow through the affected artery is particularly challenging owing to the small size of the vessels, and ligation may be required. We report, to the best of our knowledge, the first case of an atherosclerotic posterior tibial artery true aneurysm successfully treated with aneurysmectomy and end-to-end direct reconstruction with a documented good long-term patency. Clinical features, imaging findings, and surgical management are described; indications and treatments (open or endovascular) are discussed.