Berry aneurysm
| A | Posterior cerebral artery | |
| B |
Vertebral artery |
|
| C |
Anterior cerebral artery |
|
| D |
Middle cerebral artery |
All are common sites of berry aneurysm, EXCEPT‑
| A |
Posterior cerebral artery |
|
| B |
Vertebral artery |
|
| C |
Anterior cerebral artery |
|
| D |
Middle cerebral artery |
Ans. is ‘b’ i.e., Vertebral artery
Location of Berry aneurysms
- Berry aneurysms commonly arise at the bifurcation of major arteries. Approximately 85% of intracranial aneurysms arise on the anterior circulation, mostly on the circle of Willis.
- Three most common locations are:
– the terminal internal carotid artery
– middle cerebral artery bifurcation
– top of the basilar artery
AIIMS 11
| A | Degeneration of internal elastic lamina | |
| B |
Degeneration of media/muscle cell layer |
|
| C |
Deposition of mucoid material in media |
|
| D |
Low grade inflammation of vessel wall |
Ans. Degeneration of media/muscle cell layer
NOT true about Berry aneurysms:
AP 08
| A |
Rupture leading to SAH |
|
| B |
Most common in posterior circulation |
|
| C |
Developmental anomaly |
|
| D |
Common in anterior circulation |
Ans. Most common in posterior circulation
Most common site for berry aneurysm rupture
| A |
Anterior circulation of brai |
|
| B |
Posterior circulation of brain |
|
| C |
Ascending aorta |
|
| D |
Descending aorta |
Ans. is ‘a’ i.e., Anterior circulation of brain
The most common sites in descending order of frequency are –
- Li Proximal portion of anterior communicating artery (at the junction of anterior communicating artery with cerebral artery)
- At the origin of the posterior communicating artery from the stem of the internal carotid artery.
- At the first major bifurcation of middle cerebral artery.
- At the bifurcation of internal carotid into middle and anterior cerebral arteries.
- Vertibrobasilar bifurcation (3%)
| A | Subarachnoid hemorrhage | |
| B |
Subdural hemorrhage |
|
| C |
Extradural hemorrhage |
|
| D |
Intra-parenchymal hemorrhage |
Ans. is ‘a’ i.e., Subarachnoid hemorrhage
| The most common cause of subarachnoid hemorrhage | Trauma |
| The most common cause of spontaneous subarachnoid hemorrhage | Rupture of Berry aneurysm
(or Saccular aneurysm) |
Also know
Mycotic aneurysm ‑
- The mycotic aneurysm is caused by a septic embolus that weakens the wall of the vessel in which it lodges.
