Li D, et al. - Researchers examined the utility of an index that expresses the degree of aortic arch angulation for predicting the false lumen thrombosis rate (FLTR) after thoracic endovascular aortic repair (TEVAR). Using postoperative CT images, they reconstructed The geometry of 48 acute type B aortic dissection (TBAD) patients (mean age: 48 years) after TEVAR. A novel angle-the degree of question mark(φ) was introduced to indicate the aortic morphology. Further, based on hemodynamics, they assessed the influence of the aortic angulation on the FLTR. Finally, they proposed a predicted mathematical model relating FLTR to aortic angulation and chose 10 patients to validate the predicted model. They observed a negative correlation of the degree of question mark with FLTR, and created the linear relationship model as follows: FLTR (%) = -1.955 × φ + 168.24 (R² = 0.437, P < 0.001). Findings support the good predictive value of the degree of the question mark for FLTR of acute TBAD following TEVAR. The higher the degree of the question mark, the less likely a complete thrombus was to be formed.