Question
140. A 36-year-old woman with inoperable brain cancer lapses into a coma and dies of cardiorespiratory failure. A horizontal section of the patient’s brain at autopsy is shown in the image. Dilation of the ventricular system in this patient was most likely caused by obstruction at which of the following anatomic locations?
| A. |
Aqueduct of Sylvius
|
| B. |
Central spinal canal
|
| C. |
Foramen of Luschka
|
| D. |
Foramen of Magendie
|
Show Answer
|
Correct Answer � A
Explanation
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|
Answer : A Aqueduct of Sylvius
Hydrocephalus refers to dilation of the ventricles by accumulated CSF. When obstruction to the flow of CSF in the brain is within the ventricles,
hydrocephalus is designated “noncommunicating.”
In noncommunicating hydrocephalus, the flow of CSF through the
ventricular system may be obstructed at the aqueduct of Sylvius by congenital malformations, neoplasms (as in this case), inflammation, or hemorrhage.
The mass of an intracranial neoplasm, combined with edema or hydrocephalus, cau
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