Flashcards in CSF Deck (14)
A blockage at the foramen of Monro will cause what?
Hydrocephalus in the lateral ventricles but not in the 3rd and 4th ventricles.
A blockage at the cerebral aqueduct (aqueduct of Sylvius--"aqueductal stenosis" or narrowing) will cause what?
Hydrocephalus in the lateral ventricles and third ventricle, but NOT in the fourth ventricle.
A blockage at the foramina of Luschka and Magendie (e.g. Dandy-Walker malformation, a genital malformation of the brain in which the cerebellum is lodged in the foramen magnus will cause what?
Hydrocephalus in all four ventricles.
A blockage in the arachnoid vili will cause what?
-Checking this w/ ciment
"Communicating hydrocephalus"--all of the ventricles are in communication with one another, but the CSF is simply not being resorbed back into the venous system.
What is "Non-communicating Hydrocephalus"?
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Hydrocephalus that results with no obvious block in the ventricular system. Often caused by bleeding which blocks the resorption of CSF by the arachnoid granulations.
Describe the flow of CSF
Cerebrospinal fluid produced by the choroid plexus flows from the lateral ventricles through the foramen of Monro, into the third ventricle, through the Sylvian aqueduct, into the fourth ventricle, out through the foramina of Luschka and Magendie, into the subarachnoid space, and up to the arachnoid granulations to be reabsorbed into the bloodstream
Abnormally high levels of RBC's in the CSF could potentially indicate what?
bleeding into the subarachnoid space
Abnormally high levels of just WBC's in CSF suggests what?
Immune or auto-immune problem
Abnormally high levels of protein in the CSF indicates what?
Altered capillary permeability (e.g. inflammation, tumor)
Abnormally high levels of immunoglobulin protein in the CSF indicates what?
Presence of plasma cells within the brain, which may indicate infection or an autoimmune disorder
Normally, CSF glucose levels are about what fraction of serum levels (except with time delay)
Low CSF glucose levels may indicate what?
Possible consumption by microorganisms (e.g. bacterial meningitis)
What are 3 mass effect pathologies that can produce an increased cranial pressure?