Lumbosacral Transitional Vertebrae (LSTV) adalah kelainan kongenital pada tulang belakang dapat berupa sacralisasi dari segmen lumbar terbawah atau lumbalisasi dari segmen sacrum superior.1
Castellvi mengklasifikasikan kelainan ini menjadi 4 tipe berdasarkan morfologinya
Castellvi classification
I: dysplastic transverse processes, defined as measuring at least 19 mm in width – it can be unilateral (Ia) or bilateral (Ib)
II: incomplete unilateral (IIa) (IIb) lumbarization/sacralization with an enlarged transverse process that has a diarthrodial joint between itself and the sacrum.
III: lumbarization/sacralization with complete osseous fusion of the transverse process(es) to the sacrum, unilateral (IIIa) or bilateral (IIIb)
IV: (Mixed) involves a unilateral type II transition with a type III on the contralateral side
Radiographs demonstrate the Castellvi classification of LSTV: (a) Type I: dysplastic enlarged transverse process (arrow); (b) Type II: pseudoarticulation of the transverse process with the sacrum with increased sclerosis (arrows); (c) Type III: fusion with the sacrum (arrows); (d) Type IV: unilateral LSTV type II (long arrow) with type III on the contralateral side (short arrow).
Sumber:
- Konin GP, et al. Lumbosacral transitional vertebrae: classification, imaging findings,
and clinical relevance. AJNR Am J Neuroradiol. 2010 Nov;31(10):1778-86. - Castellvi AE, et al. Lumbosacral transitional vertebrae and their relationship with lumbar
extradural defects. Spine (Phila Pa 1976). 1984 Jul-Aug;9(5):493-5.3 Castellvi AE, et al. Lumbosacral transitional vertebrae and their relationship with lumbar
extradural defects. Spine (Phila Pa 1976). 1984 Jul-Aug;9(5):493-5. - Nardo L, Alizai H, Virayavanich W, et al. Lumbosacral transitional vertebrae: association with low back pain. Radiology. 2012;265(2):497–503. doi:10.1148/radiol.12112747
