Definitions for "Chiari malformation"
is an abnormality of the back of the brain. Also known as Arnold Chiari malformation, this is an uncommon congenital anomaly (occurrence at birth) in which two parts of the brain, the brainstem and the cerebellum, are longer than normal and protrude down into the spinal canal causing tissue compression and hindering normal spinal fluid flow.
a condition in which the cerebellum lies lower than normal in the skull, descending into the spinal column
a congenital (present at birth) defect in the area of the back of the head where the brain and spinal cord connect