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Table 3 The numbers of branches of subsegmental pulmonary veins found to course within subsegments or between subsegments in 103 patients and a comparison of the names of the pulmonary veins according to the nomenclature systems proposed by Boyden [19, 20], Yamashita [18], Arai [21], and Nomori and Okada [22]

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

Sub-segment

S1 + 2a

S1 + 2b

S1 + 2c

S3a

S3b

S3c

S4a

S4b

S5a

S5b

LLL

Total

V1l

   

55

       

55

   

Y

        

S1 + 2a

38

92

17

6

8

83

2

0

0

0

 

246

B,Y

B,Y,A,N

  

B

Y,A,N

      

S1 + 2b

 

21

92

3

0

2

0

1

0

0

 

119

  

B,Y,A,N

         

S1 + 2c

  

17

41

1

1

57

2

1

0

3

123

   

B,A,N

        

S3a

   

4

39

8

48

14

2

0

2

117

    

Y,N

 

B,A

B

    

S3b

    

11

85

16

66

24

0

 

202

    

B

Y,A,N

N

Y,A

    

S3c

     

14

1

3

1

0

 

19

S4a

      

5

46

37

7

3

98

       

Y,N

Y,A

B

  

S4b

       

22

73

9

1

105

        

B,Y,A,N

B

  

S5a

        

6

52

0

58

         

Y,A,N

  

S5b

         

3

1

4

Total

38

113

126

109

59

193

129

154

144

71

10

1146

  1. V1l: l means lateral and was separately counted, because this subsegmental pulmonary vein courses between the region involving S1 + 2 a, b, and c, and S3a. The sites of segmental veins are marked with the nomenclature systems proposed by Boyden (B), Yamashita (Y), Arai (A), and Nomori and Okada (N). The abbreviation “S1 + 2” indicates the apicoposterior segment; “a”, apical; “b” subapical posterior; “c”, horizontal. “S3” indicates the anterior segment; “a”, lateral; “b”, medial; “c”, superior. “S4” indicates the lingular superior segment; “a”, lateral; “b”, anterior. “S5” indicates the lingular; “a”, superior; “b”, inferior. LLL indicates the left lower lobe