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Table 1 The numbers of patients with the various combinations of branching patterns of the pulmonary arteries and the bronchi according to Yamashita’s classification [18] in the left upper lobes (LUL)

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

  Bronchial type  
  Apico- Subapico- Anterior  
  anterior anterior extension type
  extension type extension type  
Pulmonary arteries Total
IL-type 17 (16.5%) 31 (30.1%) 18 (17.5%) a,* 66 (64.1%)
M-type 16 (15.5%) 18 (17.5%) 3 (2.9%) b,* 37 (35.9%)
Total 33 (32.0%) 49 (47.6%) 21 (20.4%) 103
  1. The bronchial branching patterns were sorted three types; apico-anterior extension, subapico-anterior extension, and anterior extension types. The letter “1 + 2” in the illustrations means the apicoposterior segment, the letter “3” anterior segment and the letter “4” upper lingual segment of LUL. 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)