PHASES Score of Greving et al for Risk of Intracranial Aneurysm Rupture

Description

Greving et al reported the PHASES score for identifying the risk of rupture for an incidental intracranial aneurysm. This can help to identify a patient who may benefit from an intervention to reduce risk. The authors are from multiple institutions from Europe, Japan and the United States.

Patient selection: incidental intracranial aneurysm, member of study population group

Outcome: 5-year rate of rupture

Parameters:

(1) population (P)

(2) hypertension (H)

(3) age (A)

(4) size of aneurysm in mm (S)

(5) earlier SAH from another aneurysm (E)

(6) site of aneurysm (S)

Parameter	Finding	Points
population	North American, non-Finnish European	0
	Japanese	3
	Finnish	5
hypertension	no	0
	yes	1
age	< 70 years	0
	>= 70 years	1
size	< 7 mm	0
	7 to 9.9 mm	3
	10 to 19.9 mm	6
	>= 20 mm	10
earlier SAH	no	0
	yes	1
site of aneurysm	internal carotid (ICA)	0
	middle cerebral (MCA)	2
	anterior cerebral (ACA), posterior communicating (Pcom), posterior circulation	4

where:

• The posterior cerebral circulation includes the vertebral, basilar and posterior cerebral arteries.

total score =

= SUM(points for all 6 parameters)

Interpretation:

• minimum score: 0

• maximum score: 22

• The higher the score the greater the risk of aneurysm rupture.

• A patient with a score >= 4 is more likely to undergo an intervention.

Total Score	5-Year Rupture
0 to 2	0.4%
3	0.7%
4	0.9%
5	1.3%
6	1.7%
7	2.4%
8	3.2%
9	4.3%
10	5.3%
11	7.2%
12 to 22	17.8%

To read more or access our algorithms and calculators, please log in or register.