Persistent Sciatic Artery and its role in limb salvage in oncological surgery

Area of Science:

• Vascular Surgery
• Congenital Anomalies
• Lower Limb Reconstruction

Background:

• The Persistent Sciatic Artery (PSA) is a rare congenital anomaly resulting from the incomplete involution of the embryonic sciatic artery.
• It can be a primary source of blood supply to the lower limb, potentially replacing the Superficial Femoral Artery (SFA).
• PSAs are associated with complications like aneurysms and embolisms in adults.

Observation:

• A case of a complete, misdiagnosed Type IIa PSA was discovered during the surgical management of a lower limb soft tissue sarcoma.
• Tumor resection necessitated the sacrifice of the femoral neurovascular bundle, leading to the failure of standard vascular reconstruction.
• The PSA, however, maintained adequate blood flow to the limb, preventing ischemia.

Findings:

• Despite failed Superficial Femoral Artery (SFA) reconstruction, the Persistent Sciatic Artery (PSA) successfully prevented limb amputation.
• The limb was saved from ischemia, and functional recovery was nearly complete.
• This highlights the PSA's potential as a limb-saving option in challenging surgical scenarios.

Implications:

• In oncologic and trauma surgery involving the lower limb, a thorough vascular assessment, including the possibility of a PSA, is recommended.
• While SFA reconstruction is preferred, the PSA can serve as a critical limb-saving alternative when other options fail.
• Early identification of PSA through imaging like computerized tomography angiography is crucial for effective surgical planning and limb salvage.