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Dilated fourth ventricle in Arnold-Chiari malformation type II: isolated fourth ventricle as sequelae of shunt?--Case

S Anegawa1, T Hayashi, R Torigoe

  • 1Department of Neurosurgery, St. Mary's Hospital, Fukuoka.

Neurologia Medico-Chirurgica
|August 1, 1993
PubMed

Insights

A female infant with Arnold-Chiari malformation type II experienced fourth ventricle dilation. Shunt placement improved symptoms by restoring cerebrospinal fluid flow, addressing aqueductal compression.

Area of Science:

  • Pediatric Neurology
  • Neurosurgery
  • Developmental Biology

Background:

  • Arnold-Chiari malformation type II is a congenital condition affecting brain development.
  • Cystic dilatation of the fourth ventricle can occur in affected infants.
  • Understanding the etiology of ventricular dilatation is crucial for effective management.

Observation:

  • A 15-month-old female infant diagnosed with Arnold-Chiari malformation type II presented with cystic dilatation of the fourth ventricle.
  • The patient underwent shunt placement into the dilated fourth ventricle to re-establish communication with the subarachnoid space.

Findings:

  • The shunt procedure resulted in symptomatic improvement and a reduction in ventricular size.
  • The cause of fourth ventricle isolation was attributed to external compression of the aqueduct by a beaking deformity of the mesencephalic spur, characteristic of Arnold-Chiari malformation type II.

Implications:

  • This case highlights a specific mechanism of fourth ventricle isolation in Arnold-Chiari malformation type II.
  • Effective surgical management, such as shunt placement, can alleviate symptoms associated with ventricular dilatation.
  • Further research into the precise mechanisms of cerebrospinal fluid flow obstruction in this malformation is warranted.

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