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. 2020 Sep 29;15:273. doi: 10.1186/s13019-020-01323-8

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]

Pulmonary vein type
Apical vein dominant type Intermediate type Central vein dominant type
Pulmonary arteries graphic file with name 13019_2020_1323_Figd_HTML.gif graphic file with name 13019_2020_1323_Fige_HTML.gif graphic file with name 13019_2020_1323_Figf_HTML.gif 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%)

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)