Presentation
Right lumbar region pain (renal colic?)
Patient Data
Hypertrophic right L5 transverse process with pseudo articulation with the sacrum representing a type IIa lumbosacral transitional vertebra (Castellvi classification).
The facet joints are unremarkable.
Case Discussion
Lumbosacral transitional vertebra (LSTV) is a commonly encountered finding. Its recognition is straightforward, but can be overlooked. Meanwhile, its clinical significance is in doubt.
The presence of low back pain along with a lumbosacral transitional vertebra makes this syndrome, but it remains controversial.
According to Castellvi classification of lumbosacral vertebrae, this case is consistent with type IIa LSTV.