Absence

Focale

Légère

Modérée

Sévère

No calcification

<180˚ on one side of the vessel

<180˚ on one

side of the vessel

>180˚ of the two sides of the vessel

>180˚ of the two sides of the vessel

Less than the half of the length of the vessel

Upper than the half of the length of the vessel

Less than the half of the length of the vessel

Upper than the half of the length of the vessel