Sacral Hypogenesis with Fixed Lumbosacral Deformity: A Case Report

Background: Congenital scoliosis caused by vertebral malformations such as block vertebrae and sacral hypogenesis often leads to complex spinal deformities, particularly when involving an oblique take-off at the lumbosacral junction. These deformities pose significant surgical challenges related to coronal and sagittal imbalance, pelvic alignment, and neural compression.