May Cause

Congenital craniovertebral junction abnormality

CSF-intensity intramedullary lesion

Flattened vertebral pedicle

Intramedullary spinal lesion

Posterior vertebral scalloping

Spinal cord atrophy

Vertebral pedicle destruction

Wide spinal canal

May Be Caused by

Arachnoiditis

Chiari I malformation

Chiari II malformation

Communicating hydrocephalus

Extramedullary tumor

Intramedullary tumor

Posterior fossa mass

Postinfarction

Severe spondylosis

Spinal stenosis

Trauma

Vascular impression