Subarachnoid hemorrhage - Fisher CT grading scale of subarachnoid bleeding

Fisher CT grading scale is used to grade severity of intracranial subarachnoid hemorrhage associated with rupture of an intracranial aneurysm. This scale predicts the risk of subsequent arterial spasms.

Group Description
Group I no hemorrhage
Group II subarachnoid hemorrhage <1mm thick
Group III subarachnoid hemorrhage >=1mm thick
Group IV

Intracranial aneurysm - description of size and neck + calculator

Apart from giving the dimensions of an intracranial aneurysm, its size should be cathegorized according to this table.

Description Size
Small ≤5mm
Medium <15mm
Large <25mm
Giant ≥25mm

The diameter of the neck of the aneurysm is cathegorized as well.

Description Size

Germinal matrix hemorrhage - grading of intracranial bleeding in neonates

Grading of intracranial hemorrhage in neonates is based on ultrasound imaging. It has four grades with increasing mortality and decreasing outcome.

Grade Description
Grade I hemorrhage is confined to the germinal matrix
Grade II intraventricular hemorrhage without ventricular dilation
Grade III intraventricular hemorrhage with ventricular dilation
Grade IV
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