Patient Characteristics
Individual informed consent was obtained from each patient, and institutional review board approval was obtained from Xiamen University. Patients with uncomplicated IMHBs were included between January 2016 and January 2018. The definition of “uncomplicated” was based on the status of the syndrome after medical treatment (without signs of aortic rupture on admission and controllable syndrome) and radiographic findings from the computed tomography angiography (CTA) examination on admission (without periaortic hematoma and ulcer-like projection [ULP])[1][4]. The data from the following were defined as missing: patients who refused further treatment, patients with incomplete imaging data to assess the evolution of IMHB or laboratory test results, and patients lost to follow-up (see details of the CONSORT diagram in Figure 1 ).