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Anatomic Features of 20 Cases

BRIAN PEACH, MD

Arch Neurol. 1965;12(6):613-621.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

IN 1891, Chiari¹ described the anomalies of the hindbrain that he found in cases of congenital hydrocephalus and divided these malformations into four categories:

Type 1 showed a variable displacement of the cerebellar tonsils into the upper cervical canal. This was unaccompanied by any caudal dislocation of the medulla.

Type 2 showed a variable displacement of the inferior vermis of the cerebellum into the upper cervical canal, and was accompanied by a similar caudal displacement of the lower pons and medulla together with an elongated fourth ventricle.

Type 3 showed a downward displacement of the medulla with herniation of the cerebellum into a high cervical meningocele.

Type 4 showed hypoplasia of the cerebellum. In a further paper in 1895, Chiari² analyzed his findings in 24 cases of congenital hydrocephalus. Seven cases fell into his type 2 category and all these were associated with a meningomyelocele. Fourteen were . . . [Full Text PDF of this Article]

Author Affiliations
BRADFORD, YORKSHIRE, ENGLAND

From the Department of Pathology, Bradford Royal Infirmary; Director of Pathology.

Footnotes
Submitted for publication Sept 25, 1964; accepted Feb 1, 1965.

Reprint requests to The Royal Infirmary, Bradford, Yorkshire England (Dr. Peach).

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