Single-Branch Endovascular Aortic Repair Procedure for an Abdominal Aortic Aneurysm in a Patient With Horseshoe Kidney: A Case Report

Introduction Horseshoe kidney (HK) is an anatomical variant characterised by abnormalities in the position, rotation, and vascular supply of the kidney, with functioning renal masses on both sides of the vertebral column fused together at the isthmus. Due to the altered pattern of kidney vascularisation, endovascular aortic repair for aortic abdominal aneurysm (AAA) in the presence of HK requires vascular anatomy specific planning. Report A 68 year old male, with multiple comorbidities, presented with an asymptomatic AAA and HK. The kidney vascularisation was characterised by the presence of three arteries: two arising laterally at the same height and a third polar artery arising from below. The polar artery was 6 mm in diameter and larger than the other two; therefore, in order to preserve this artery, a custom-made device with a single side branch was implanted below the “main” renal arteries. A balloon expandable covered stent was used to complete the side branch into the polar renal artery. The follow up computed tomography angiography scan revealed a successful outcome, with total aneurysm exclusion, branched graft patency, no endoleak, and unchanged renal function. Discussion This case report shows a possible surgical solution for a case of HK with AAA and the importance of accurate endovascular planning. Large polar arteries, if present, need to be preserved, and custom-made devices in the modern endovascular era permit that. This approach could represent the best option for complicated patients.