Internal carotid artery aneurysm - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-28-2012
MedicalExaminer's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 824
Threads: 66
Thanked 463 Times in 298 Posts
Reputation: 473
Neuro Internal carotid artery aneurysm

A 53-year-old woman presents with a complaint of persistent headache and double vision. The MRI reveals what appears
to be a vascular lesion within the cavernous sinus, and angiogram confi rms that it is an aneurysm of the intracavernous
portion of the internal carotid artery. Which of the following structures would most likely be the fi rst structure to be
affected by this expanding lesion?

(A) The abducens nerve
(B) The mandibular nerve
(C) The maxillary nerve
(D) The oculomotor nerve
(E) The trochlear nerve
__________________
Everything is possible for him who believes (MARK 9:23)
245/247/passed on 1st attempt/223/2mos Obsie /3 US LORS/visa not needed/2008 grad
Reply With Quote Quick reply to this message
The above post was thanked by:
amresh kumar (07-30-2012), curiousmind (07-28-2012)



  #2  
Old 07-28-2012
Dr.Lacune's Avatar
USMLE Forums Veteran
 
Steps History: 1+CK+CS
Posts: 207
Threads: 38
Thanked 116 Times in 46 Posts
Reputation: 126
Default

The abducens nerve.. it lies very close to the artery, in contrast to other contents of the sinus.
__________________
IT IS GETTING INTENSE !!
Reply With Quote Quick reply to this message
  #3  
Old 07-28-2012
curiousmind's Avatar
USMLE Forums Scout
 
Steps History: ---
Posts: 82
Threads: 5
Thanked 21 Times in 15 Posts
Reputation: 31
Default

Internal carotid artery is medial most structure in cav. sinus,
abducent is inferolat. to the artery.

Must be abducent nerve affected first.

structures in lat wall are - 3rd , 4th
and ophthalmic and maxillary div of 5th nerve.
Reply With Quote Quick reply to this message
 
  #4  
Old 07-28-2012
sruthi's Avatar
USMLE Forums Addict
 
Steps History: Not yet
Posts: 109
Threads: 24
Thanked 19 Times in 11 Posts
Reputation: 29
Default

abducens n
Reply With Quote Quick reply to this message
  #5  
Old 07-29-2012
MedicalExaminer's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 824
Threads: 66
Thanked 463 Times in 298 Posts
Reputation: 473
Default ...........................

well fellows A is correct

In this particular situation, there are three structures located in the cavernous sinus that, if damaged, could lead to diplopia: the abducens, oculomotor, and trochlear nerves. However, the position of the abducens nerve, immediately adjacent to the internal carotid artery, makes it the most likely of these three nerves to be initially damaged. The oculomotor and trochlear nerves, along with the maxillary nerve, are located in the lateral wall of the cavernous sinus and may be injured later as the aneurysm enlarges. Damage to the maxillary nerve may result in somatic sensory loss over the cheek area and upper teeth and palate on the same side. The mandibular nerve does not traverse this sinus but exits the skull via the foramen ovale.
__________________
Everything is possible for him who believes (MARK 9:23)
245/247/passed on 1st attempt/223/2mos Obsie /3 US LORS/visa not needed/2008 grad
Reply With Quote Quick reply to this message



Reply

Tags
Neuroanatomy-, Step-1-Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Right Common Carotid Artery versus Internal Jugular Vein ricko335 USMLE Step 1 Forum 8 09-11-2011 08:40 AM
Blocking the Carotid Sinus Reflex! nudrat USMLE Step 1 Forum 1 07-05-2011 04:44 PM
Indication of Carotid Endarterectomy docoftheworld USMLE Step 2 CK Forum 8 06-01-2011 03:36 PM
charcot-bouchard aneurysm versus saccular aneurysm kemoo USMLE Step 1 Forum 3 04-29-2011 09:44 AM
Carotid sheath dr z USMLE Step 1 Mnemonics 0 01-15-2011 02:31 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)