Objective To analyze the MSCT manifestations of spontaneous isolated superior mesenteric artery intramural hematoma (SISMAIH) to improve the recognition and diagnosis of this disease.Methods MSCT manifestations of 15 clinically confirmed cases were analyzed retrospectively.Results All the 15 cases showed circular or crescent wall thickening,without tearing intimal flap.Conclusion SISMAIH have some characteristic MSCT manifestations,and MSCT can be used as an important and effective method for the diagnosis of this disease.