Aim To analyze the manifestations and outcomes of multi-slice spiral CT angiography (MSCTA) in isolated superior mesenteric artery dissection (ISMAD). Methods The CT data of 14 cases of isolated superior mesenteric artery dissection were retrospectively analyzed by Xiong Jiang's ISMAD image typing method. Results Among the 14 patients, 5 cases were Ⅰ type, 1 case was Ⅱ type, 6 cases were Ⅲ type and Ⅲa, 1 case was Ⅳ type, and 1 case was Ⅴ type. After conservative treatment, 4 cases were followed up, 1 case of Ⅰ type true cavity patency, 1 case of type Ⅰ without change, 1 case of Ⅲa type bag ulcer expansion, 1 case of Ⅲa type false lumen scope expansion, with true cavity further compression narrowed. Conclusion Xiong Jiang's ISMAD image typing method is accurate, rapid and effective for MSCTA diagnosing isolated superior mesenteric artery dissection. It is helpful to evaluate the dynamic changes and outcome of isolated superior mesenteric artery dissection.