Known Chiari: Dizziness, near syncope. There are unchanged mildly low-lying cerebellar tonsils, with otherwise rounded morphologies and essentially intact biphasic cerebrospinal fluid flow across the foramen magnum. The spinal cord appears unremarkable, without evidence of syringohydromyelia. There is lack of the usual cervical lordosis, but no evidence of spondylolisthesis. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. There is dependent edema in the posterior lower back subcutaneous tissues.
1. Unchanged mildly low-lying cerebellar tonsils, with otherwise rounded morphologies and essentially intact cerebrospinal fluid flow across the foramen magnum. 2. No evidence of syringohydromyelia.