Another Arnold!
Topic: Pediatric
Created on Saturday, November 8 2008 by rednucleus
Last modified on Saturday, November 8 2008.
A child has been referred to you as having Arnold-Chiari malformation type II. The presence of which one of the following would suggest type I, not type II malformation?
A) Inferiorly displaced cerebellum B) Beaked tectum C) Normal brain D) Medullary kink E) Inter-digitated gyri
This question was created on November 08, 2008 by rednucleus.
This question was last modified on November 08, 2008.
ANSWERS AND EXPLANATIONS
A) Inferiorly displaced cerebellum
This answer is incorrect.
Grossly normal brain is compatible with type I, not type II, malformation. Type II malformation may demonstrate medullary kink, beaked tectum, inter-digitated gyri, and inferiorly displaced vermis, and that their cerebellum seems to creep around the brainstem. (
See References)
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B) Beaked tectum
This answer is incorrect.
Grossly normal brain is compatible with type I, not type II, malformation. Type II malformation may demonstrate medullary kink, beaked tectum, inter-digitated gyri, and inferiorly displaced vermis, and that their cerebellum seems to creep around the brainstem. (
See References)
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C) Normal brain
This answer is correct.
Grossly normal brain is compatible with type I, not type II, malformation. Type II malformation may demonstrate medullary kink, beaked tectum, inter-digitated gyri, and inferiorly displaced vermis, and that their cerebellum seems to creep around the brainstem. (
See References)
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D) Medullary kink
This answer is incorrect.
Grossly normal brain is compatible with type I, not type II, malformation. Type II malformation may demonstrate medullary kink, beaked tectum, inter-digitated gyri, and inferiorly displaced vermis, and that their cerebellum seems to creep around the brainstem. (
See References)
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E) Inter-digitated gyri
This answer is incorrect.
Grossly normal brain is compatible with type I, not type II, malformation. Type II malformation may demonstrate medullary kink, beaked tectum, inter-digitated gyri, and inferiorly displaced vermis, and that their cerebellum seems to creep around the brainstem. (
See References)
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References:
1. Victor, M., and Ropper, A.H. (2001). Adams and Victor's Principles of Neurology, 7th Edition. McGraw-Hill, New York. (ISBN:0070674973) | Advertising:
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pediatric
Another Arnold!
Question ID: 110808114
Question written by rednucleus. (C) FrontalCortex.com 2006-2009, all rights reserved.
Created: 11/08/2008
Modified: 11/08/2008
Estimated Permutations: 120