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56 ± 3.9mm below the P-IOP line; while in controls, this distance was 12.53 ± 4.28 mm (p 0.01). In Goel type A BI, the distance was 7.01 ± 3.78 mm and in type B BI, it was 5.07 ± 4.19 mm (p = 0.004). Receiver-operating characteristic curve analysis identified 9.0 mm (8.92-9.15 mm) as the cut-point for diagnosing BI using the odontoid tip-P-IOP line distance as reference. The odontoid tip either intersecting the P-IOP line (very high BI) or being 9 mm below the P-IOP line (Goel types A and B BI) is recommended as highly applicab