A 25-year-old man presented to the office due to a severe headache that has been present for the last month. The headache intensifies in the morning and is associated with nausea and vomiting. Brain imaging shows a tumor, with enlarged lateral and third ventricles. The fourth ventricle has a normal size. The patient has an obstruction in which of the following structures?

Question

Quizplus · Accepted Answer

Eductional Objective: The cerebral aqueduct of Sylvius forms the passage for the CSF to flow from the third to the fourth ventricle. Stenosis of obstruction at this point is manifested as enlarged lateral and third ventricle with the normal-sized fourth ventricle. Foramen of Monro obstruction leads to lateral ventricle enlargement, while obstruction of the foramen of Magendie and Luschka causes the four ventricles to be enlarged.

A 25-Year-Old Man Presented to the Office Due to a Severe