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Table 1 The length of the surgical channel with the MIS ASR and the TO method

From: Surgery for craniovertebral junction pathologies: minimally invasive anterior submandibular retropharyngeal key-hole approach

No. of patient

MIS ASR

TO

I-C1 (mm)

I-C2 (mm)

I-D (mm)

DF (cm2)

O-C1 (mm)

O-C2 (mm)

O-D (mm)

DF (cm2)

1

105

91

128

3.50

76

85

98

5.81

2

98

79

110

4.83

89

96

111

7.35

3

95

74

102

5.44

77

93

101

5.44

4

78

70

101

4.84

74

86

91

5.61

  1. MIS ASR minimally invasive anterior submandibular retropharyngeal key-hole approach, TO transoral approach, I-C1 distance between the incision and C1 vertebra’s anterior tubercle, I-C2 distance between the incision and the ventral base of C2 vertebra, I-D distance between the incision and the deepest point of the dura mater, DF decompressed dura mater surface, O-C1 distance between the orifice and C1 vertebra’s anterior tubercle, O-C2 distance between the orifice and the ventral base of C2 vertebra, O-D distance between the orifice and the deepest point of the dura mater