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Old 11-10-2012
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Arrow Billy Step 1 Questions # 78

A 40-year-old man was admitted to the neurology service for evaluation of persistent numbness over his left jaw and lower face. MRI reveals a schwannoma, which is compressing a cranial nerve as the nerve exits the skull. The cranial nerve involved in this case exits the skull through which of the following foramina?


(A) Foramen ovale
(B) Foramen rotundum
(C) Foramen spinosum
(D) Jugular foramen
(E) Superior orbital fissure
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Old 11-10-2012
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Mandibular nerve exiting the Foramen ovale (A) is being compressed.
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Old 11-10-2012
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Quote:
Originally Posted by billy View Post
A 40-year-old man was admitted to the neurology service for evaluation of persistent numbness over his left jaw and lower face. MRI reveals a schwannoma, which is compressing a cranial nerve as the nerve exits the skull. The cranial nerve involved in this case exits the skull through which of the following foramina?


(A) Foramen ovale
(B) Foramen rotundum
(C) Foramen spinosum
(D) Jugular foramen
(E) Superior orbital fissure
a)foramen ovale:mandibular branch of trigeminal nerve.. 5th cr.nerve with likelihood of getting compressed by schwanomma at C-P angle
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Old 11-10-2012
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Default A

agreed....
schwanoma affects CNVIII>VII and V
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Old 11-10-2012
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Answer is A. Foramen ovale - mandibular branch of trigeminal nerve
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Old 11-11-2012
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Correct Answer A is correct

The foramina of the trigeminal nerve divisions can be remembered with the mnemonic Standing Room Only (SRO) for the Superior orbital fissure, foramen Rotundum, and foramen Ovale, which transmit cranial nerves (CNs) V1, V2, and V3, respectively. This patient has a schwannoma of the mandibular division of the trigeminal nerve (CN V3) as the nerve exits the skull through the foramen ovale. Compression of V3 causes numbness over the ipsilateral jaw and lower face.
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