Fig. 2

The three-dimensional computed tomography bronchography and angiography. The apical subsegmental bronchi(B¹a and B¹b) originated from the posterior segmental bronchus (B²) and the anterior segmental bronchus (B³⁾ respectively; The right upper pulmonary artery shared trunk without posterior ascending artery (Asc.A²); The right upper pulmonary vein had no central vein, with only one posterior intrasegmental vein(V²t), the other two veins pointed to the intersegmental plane respectively. a Posterior view; b Lateral view