Saccular aneurysm



Saccular aneurysm

Nervous system

Autonomic nervous system disorders

Horner syndrome

Orthostatic hypotension


Saccular aneurysm


0 / 1 complete

USMLE® Step 1 questions

0 / 3 complete

High Yield Notes

18 pages


Saccular aneurysm

of complete


USMLE® Step 1 style questions USMLE

of complete

A 40-year-old man with a history of autosomal dominant polycystic kidney disease presents to the emergency department for evaluation of a sudden onset severe headache. An hour ago, the patient woke up suddenly with an excruciating headache that reached maximum intensity within seconds. His additional medical history includes hypertension and a 20 pack year smoking history. Temperature is 37.0°C (98.6°F), pulse is 110/min, and blood pressure is 150/90 mmHg. On physical examination, nuchal rigidity is noted. A non-contrast CT of the head is obtained and is unremarkable. A lumbar puncture is performed. Which of the following is most likely to be found on further evaluation of this patient’s cerebrospinal fluid?  

External References

First Aid






Anterior communicating artery

saccular aneurysm p. 533


saccular aneurysm p. 533

Ptosis (eyelids)

saccular aneurysm p. 533


A saccular aneurysm is a round bulge in the wall of a blood vessel, usually an artery. Saccular aneurysms are the most common form of cerebral aneurysm and are caused by a weakening of the vessel wall, which can be caused by aging, high blood pressure, cigarette smoking, and genetic factors. An aneurysm can rupture and cause internal bleeding, which is a serious and life-threatening emergency condition that needs prompt management. Treatment for a saccular aneurysm usually involves open surgery or endovascular repair.


Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Cookies are used by this site.

USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.