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Table 2 The numbers of patients with the various combinations of branching patterns of the pulmonary arteries and veins according to Yamashita’s classification [18]

From: Anatomical analysis of the left upper lobe of lung on three-dimensional images with focusing the branching pattern of the subsegmental veins

 

Pulmonary vein type

 

Apical vein dominant type

Intermediate type

Central vein dominant type

Pulmonary arteries

Total

IL-type

51 (49.5%) a,*

15 (14.6%) b,*

0 b,*

66 (64.1%)

M-type

18 (17.5%) b,*

16 (15.5%) a,*

3 (2.9%) a,*

37 (35.9%)

Total

69 (67.0%)

31 (30.1%)

3 (2.9%)

103 (100%)

  1. The veinous branching patterns were sorted three type; apical vein dominant, intermediate, and central vein dominant types. The letter “AV” means apical vein, “CV” central vein and “LV” lingular vein. M- and IL-types indicate LUL having lingular pulmonary artery all or partly from pars mediastinalis, and lingular pulmonary artery all from pars inter lobaris, respectively. The numbers having superscripts “a” and “b” are significantly higher and lower than the theoretical numbers, respectively. *, p < 0.05 (Chi-square test)