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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
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