"Atlas (C1) vertebra"
Expected headings
"Congenital"
"Basiocciput"
"Atlas (C1) vertebra"
"Axis (C2) and odontoid process"
"Developmental and acquired"
"Malformations at the foramen magnum"
"Craniovertebral junction (CVJ) anomalies also known as craniocervical junction anomalies, can be congenital, developmental or due to malformation secondary to an acquired disease process. These anomalies can lead to cranial nerve compression, vertebral artery compression, and obstructive hydrocephalus."