Renal Trauma AAST Grade IV

A 35-year-old man presents to the emergency department following a motor vehicle collision with blunt right flank trauma. CT scan with IV contrast and delayed excretory phase imaging reveals the structure marked **A** in the diagram — a renal laceration extending through the cortex and medulla with contrast extravasation beyond Gerota fascia. The patient is hemodynamically stable with a systolic BP of 118 mmHg and heart rate of 88 bpm. Hemoglobin is 11.2 g/dL (baseline 14.5 g/dL). Which of the following is the most appropriate next step in management according to current AAST 2018 guidelines?