Basilar invagination is a medical condition where the base of the skull, specifically the occipital bone, pushes upward into the spinal canal. This can lead to compression of the brainstem and spinal cord, potentially causing neurological symptoms such as headaches, neck pain, and balance issues. It is often associated with congenital conditions like Chiari malformation. Diagnosis typically involves imaging studies, such as MRI or CT scans, to visualize the skull and spine. Treatment options may include monitoring, physical therapy, or surgical intervention to relieve pressure on the nervous system and improve symptoms.