Table 1 Vascular pattern variability in the pelvis

Analyzed variations

Types

Number of patients

%

Branching pattern of internal iliac vein^a

I

39

48.1%

IIa

11

13.6%

IIb

13

16.0%

IIc

7

8.6%

IIIa

9

11.1%

IIIb

1

1.2%

IV

1

1.2%

Analyzed variations

Types

Number of pelvic halves^c

%

Section of the route in sacral nerve plexus, through which the SGA passes^b

Lateral to L5

27

16.7%

L5-S1

133

82.1%

S1-S2

2

1.2%

Section of the route in sacral nerve plexus, through which the SGV passes^b

Lateral to L5

68

42.0%

L5-S1

77

47.5%

S1-S2

61

37.7%

Medial to S2

2

1.2%

Inter-relationship between the IGA and the IPA at the exit of the pelvis

IGA medial and IPA lateral

104

64.2%

IGA lateral and IPA medial

13

8.0%

IGA and IPA as a common trunk

19

11.7%

Others

26

16.0%

Aberrant obturator vein

Present

114

70.4%

Absent

48

29.6%