Some popliteal aneurysms are congenital

Area of Science:

• Vascular Surgery
• Genetics
• Pathology

Background:

• Popliteal aneurysms are typically atherosclerotic, affecting individuals over 50.
• A small percentage arise from trauma, infection, Behcet's disease, fibromuscular dysplasia, or popliteal entrapment.

Purpose of the Study:

• To investigate a potential congenital etiology for popliteal aneurysms in younger patients without other identifiable causes.
• To explore the link between popliteal artery's complex structure and arterial wall fragility.

Main Methods:

• Retrospective review of five patients (aged 20-45) with seven non-atherosclerotic popliteal aneurysms.
• Histological examination of arterial walls in two patients.
• Clinical follow-up of patients treated with saphenous bypass grafts or managed conservatively.

Main Results:

• Histology revealed arterial walls replaced by collagen in two patients.
• Four patients treated with saphenous bypass grafts showed good outcomes.
• One patient with asymptomatic tibial/peroneal artery occlusion remained well without surgery.
• One patient had associated bilateral congenital anomalies of popliteal artery branching.

Conclusions:

• A congenital etiology is proposed for popliteal aneurysms in younger individuals lacking typical risk factors.
• The popliteal artery's composite structure may predispose to fragility, aneurysms, or entrapment.
• These aneurysms share thrombosis risks with atherosclerotic types, necessitating similar therapeutic approaches.