Hijdra et al developed a score for grading the amount of subarachnoid hemorrhage following aneurysmal rupture as seen on computed tomography (CT) scans. This can be used to evaluate the patient on presentation and to monitor the patient following therapeutic interventions. The authors are from Amsterdam, Utrecht and Rotterdam in The Netherlands.


Anatomic sites examined:

(1) 10 basal cisterns and fissures

(2) 4 ventricles


Basal cisterns and fissures:

(1) frontal interhemispheric fissure

(2) left Sylvian fissure, lateral part

(3) right Sylvian fissure, lateral part

(4) left Sylvian fissure, basal part

(5) right Sylvian fissure, basal part

(6) left suprasellar fissure

(7) right suprasellar fissure

(8) left ambient cistern

(9) right ambient cistern

(10) quadrigeminal cistern



(1) left lateral

(2) right lateral

(3) third

(4) fourth


Amount of Blood




small amount


moderate amount


completely filled with blood



subscore for basal cisterns and fissures =

= SUM(points for all 10 basal cisterns and fissures)


subscore for ventricles =

= SUM(points for all 4 ventricles)


total score =

= (subscore for basal cisterns and fissures) + (subscore for ventricles)



• minimum for subscores and total score: 0

• maximum subscore for basal cisterns and fissures: 30

• maximum subscore for ventricles: 12

• maximum total score: 42


The rate of clearance of blood after surgery can be calculated as:


percent clearance of blood after surgery =

= ((total score on admission) - (total score on day after surgery)) / (total score on admission) * 100%


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