Definition of Arnold-chiari deformity
1. Noun. Deformity in which part of the brain protrudes through the skull.
Medical Definition of Arnold-chiari deformity
1. A congenital anomaly in which the cerebellum and medulla oblongata, which is elongated and flattened, protrude down into the spinal canal through the foramen magnum. It may be associated with many other defects, including spina bifida occulta and meningomyelocele. (12 Dec 1998)
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