hemivertebrae

Hemivertebrae are congenital abnormalities of the spine characterized by the incomplete formation of a vertebra. Instead of a typically rectangular shape, a hemivertebra is triangular or wedge-shaped because only one side of the vertebral body has developed. This malformation can occur in any part of the spine, but is most commonly found in the thoracic or lumbar regions.

The cause of hemivertebrae is believed to be a developmental error during embryogenesis, specifically in the ossification centers of the vertebrae. The exact reason for this error is not fully understood, but it is thought to involve genetic and environmental factors. Hemivertebrae can occur in isolation or as part of a broader spectrum of congenital conditions.

Many individuals with hemivertebrae are asymptomatic, and the condition may be discovered incidentally during imaging for other reasons. However, depending on the location and severity of the hemivertebra, it can lead to spinal deformities such as scoliosis (sideways curvature) or kyphosis (forward curvature). These deformities can cause pain, neurological symptoms like numbness or weakness, or affect lung function if severe and in the thoracic region. Diagnosis is typically made through X-rays, CT scans, or MRI. Treatment strategies vary based on the presence and severity of symptoms and deformities, ranging from observation to surgical correction.