Differences in vertical mid-vertebral angles: with LSTV
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Mid-sagittal and volume render CT image of a patient with lumbosacral transitional vertebra (LSTV) with solid bony bridge.
Note the two most caudal segment angles:
- Caudal angle = 22.5°
- Cephalad angle = 40.0°
- Diff-VMVA (caudal minus cephalad) = -17.5°
Diff-VMVA of ≤+10° suggests LSTV Castellvi type III or IV,1 i.e. solid bony bridge as in our case.
Volume render CT image shows complete fusion of bilateral transverse process with the adjacent sacral ala (Castellvi type IIIb).
- 1. Farshad M, Aichmair A, Hughes AP et-al. A reliable measurement for identifying a lumbosacral transitional vertebra with a solid bony bridge on a single-slice midsagittal MRI or plain lateral radiograph. Bone Joint J. 2013;95-B (11): 1533-7. doi:10.1302/0301-620X.95B11.32331 - Pubmed citation