A 68-year-old woman from Mumbai presents with acute right flank pain and haematuria. She has a history of hypertension and atherosclerotic disease. CT angiography of the abdomen shows a 4 cm right renal artery aneurysm with active extravasation of contrast into the perirenal space. The patient is haemodynamically stable. Renal function is preserved (creatinine 1.0 mg/dL, eGFR 72 mL/min). The interventional radiologist discusses treatment options. Which of the following is the most appropriate management strategy?