a congenital deformity in which the medulla oblongata and cerebellum protrude through the foramen magnum. This means that the cerebellum overlaps the top of the spinal cord. Complications include hydrocephalus and meningomyelocele. (Julius Arnold (1835-1915), German pathologist- Hans Chiari (1851-1916), Austrian pathologist!

ARNOLD-CHIARI MALFORMATION: "Arnold-Chiari malformation refers to a condition whereby the medulla and cerebellum overlap the spinal cord in an unusual manner, thus leading to complications."
Cite this page: N., Pam M.S., "ARNOLD-CHIARI MALFORMATION," in, April 7, 2013, (accessed October 20, 2021).