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Zoe MCQ 05

Topic: Anatomy

Created on Saturday, November 26 2022 by zoe

Last modified on Saturday, November 26 2022.

A young patient presents with a low-grade astrocytoma of the midbrain with signs of increased intracranial pressure from hydrocephalus. The patient required a shunt to drain the fluid and focal irradiation of the tumor, and later required no further therapy. Where would we suspect the tumor was compressing, resulting in the hydrocephalus?

A) Interventricular foramina (of Monro)

B) Fourth ventricle

C) Cerebral aqueduct (of Sylvius)

D) Third ventricle

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This question was created on November 26, 2022 by zoe.
This question was last modified on November 26, 2022.

ANSWERS AND EXPLANATIONS

A) Interventricular foramina (of Monro)

This answer is incorrect.

This would be at the level of the diencephalon, not the midbrain (See References)

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B) Fourth ventricle

This answer is incorrect.

This would be at the level of the pons and medulla (See References)

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C) Cerebral aqueduct (of Sylvius)

This answer is correct.

The third ventricle in turn communicates with the fourth ventricle of the pons and medulla through the narrow cerebral aqueduct (of Sylvius) of the midbrain. (See References)

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D) Third ventricle

This answer is incorrect.

The third ventricle is above the midbrain, draining into the cerebral aqueduct (of Sylvius) in the midbrain to the fourth ventricle (See References)

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References:

1. Nolte: Chapter 5: Pages 99
2. Robertson PL, Muraszko KM, et al. Pediatric midbrain tumors: a benign subgroup of brainstem gliomas. Pediatr Neurosurg. 1995;22(2):65-73.

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anatomy
Zoe MCQ 05
Question ID: 112622077
Question written by zoe. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 24