Karnataka PGET Medicine MCQ Answer 29

Communicating Hydrocephalus

• obstruction is along the subarachnoid flow of CSF distal to the outlet of the foramen of L & M
• usually occurs at the level of the basal cistern
• Clinical disorders where this is seen:

1. post-meningitis fibrosis of the SAS and AV

2. organizing subarachnoid hemorrhage
3. meningeal tumor
4. arnold-chiari malformation
5. Non-obstructive communicating hydrocephalus

• choroid plexus papilloma
• overproduction of CSF may result
• arachnoid villi are saturated

• obstruction is intraventricular
• most common site

1. foramen of Monro

2. 4^th ventricle
3. cerebral aqueduct

• most commonly seen in:

1. CNS tumors – by far most common
2. Cysts
3. Large cerebral artery aneurysms
4. Hemorrhage
5. malformations

• syndrome of slow growing hydrocephalus
• triad of clinical features – dementia, urinary incontinence, and ataxia

Hydrocephalus ex vacuo (compensatory Hydrocephalus)

• occurs with atrophy and loss of brain substance
• compensatory expansion of the ventricular system

Category: Karnataka PGET 2007 MCQs