The filling defect sign was classified as central type (n=117, 9.43%), mural type with sharp angle (n=226, 18.21%), mural type with obtuse angle (n=576, 46.41%) and completely-obstructed type (n=215, 17.32%).

• 肺动脉内充盈缺损包括中心型 117支 (9.；4 3%25 )；锐角附壁型 2 2 6支(18