Gonadal artery aneurysm is a rare condition characterized by nonspecific presentation, typically manifesting as flank pain and formation of a retroperitoneal hematoma on imaging studies. Failure to recognize and treat this condition promptly can have serious consequences, as the presence of an aneurysm may lead to severe bleeding. Notably, most reported cases of gonadal artery aneurysms are not trauma-induced but rather spontaneous. In this case report, we describe the case of a previously healthy woman in her late 30s who presented to the emergency department with initial symptoms of flank pain and elevated white blood cell count. Subsequent imaging via computed tomography of the abdomen and pelvis revealed a significant hematoma surrounding the right kidney, indicative of a substantial hemorrhagic event. Angioembolization followed by endograft placement was performed on the patient, and she was expected to make a full recovery.