Perirenal hemorrhage secondary to interventional radiology operation against head and neck vessels: two cases report and review of the literature

Due to the hidden hemorrhage and a lack of specificity in its manifestations, perirenal hemorrhage as a complication of interventional radiology procedures is not always diagnosed in a timely manner; furthermore, the cause of hemorrhage is often misidentified or uncertain. In this report, two cases of elderly male patients who each had a perirenal hemorrhage on the same side after an interventional radiology operation against head and neck vessels by the same operator on the same day are described. This study demonstrated that the perirenal hemorrhages in both patients were related to the interventional radiology operations, providing a reminder that operating gently and always keeping the guide wire in sight during the insertion are critical for reducing the incidence rate of perirenal hemorrhage.