A 69-year-old white man presented to the emergency department after a tractor-on-tree collision. Contrast-enhanced computed tomography demonstrated an incidental right infrarenal, retroperitoneal mass measuring 9.7 × 7.7 × 9.1 cm (Figure 1A), with dilated tortuous supply from a lumbar artery branch and retroperitoneal lymphadenopathy. He denied any history of systemic symptoms, pain, urinary symptoms, or abnormal bowel function but described 6 years of decreased appetite. Laboratory evaluation of plasma-free metanephrine levels showed a slight elevation in normetanephrine levels (1.21 nmol/L). Given the dramatic arterial enhancement and hypertrophied perivascular plexus, biopsy was not performed, and preoperative arterial embolization was deemed appropriate to minimize intraoperative blood loss.