<正>Objective: To describe the characteristic appearance of cavernous hemangioma of the liver （CHL） presented in carbon dioxide digital subtraction angiography （CO2-DSA） and to evaluate the significance of CO2-DSA in the diagnosis of CHL. Methods: Both CO2-DSA and iodinated contrast DSA （IC-DSA） were performed in all 16 patients with CHL

and the angiographic manifestations in the same patients were compared. The image quality was rated by three experienced angiographers

and the complications were also assessed. Results: There was good correlation between angiographers on image quality （R = 0. 73）. Diagnostic images were obtained with both CO2-DSA and IC-DSA in all CHL patients. No difference was noted between IC-DSA and CO2-DSA in visualizing the proper hepatic arteries and its branches （P>0. 05）. CO2-DSA produced better images that clearly described the tumor size

shape and margination than those by IC-DSA （P< 0. 05）

but both demonstrated characteristic appearances of early opacification and persistent