Current dorsal myelographic column and dural diameter reduction rules do not apply at the cervicothoracic junction in horses.
VETERINARY RADIOLOGY & ULTRASOUND(2018)
摘要
Previously published myelographic studies do not report findings at the junction between the seventh cervical (C7) and first thoracic vertebrae (T1). Modern digital radiographic equipment allows improved visualization of C7-T1. Based on clinical experience, we hypothesized that 50% reduction of the dorsal myelographic column or 20% reduction of the dural diameter, criteria commonly used as a supportive finding for spinal cord compression in the cervical vertebral column, do not apply at C7-T1. A myelographic study was performed on 12 healthy, neurologically normal horses. Our hypothesis was confirmed; using established criteria eight of 12 horses would have been classified as having evidence of spinal cord compression at C7-T1. The dorsal myelographic column reduction at C7-T1 was 48 +/- 12%, while the C6-C7 dorsal myelographic column reduction was 33 +/- 17% (mean +/- standard deviation) (P = 0.010). The dural diameter reduction at C7-T1 (22.0 +/- 6.7%) was significantly greater than the dural diameter reduction at C6-C7 (13.2 +/- 9.5%) (P = 0.0007). Further measurements and comparisons suggested that the apparent greater reduction of dorsal myelographic column and dural diameter at C7-T1 was due to larger intravertebral measurements at C7 rather than smaller intervertebral values at C7-T1. Based on these findings, alternative criteria should be used at C7-T1 when assessing clinical cases for cervical stenotic myelopathy. Reduction of the dorsal myelographic column by 60% or of the dural diameter by 30% would avoid high numbers of false positive myelographic cases at C7-T1.
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关键词
cervical stenotic myelopathy,contrast column,dural diameter,vertebra
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