Preferably use computer-assisted volumetric analysis

In case width is measured, report detailed methodology

Measured perpendicular to the midline joining the most anterior and posterior visible points on the falx

Measurements should be conducted on axial and coronal slices

On axial slices measured at the level and location of the foramen of Monro and as the maximum displacement of the septum pellucidum relative to the midline

On coronal slices as the maximum MLS of the septum pellucidum at the level of the highest point of the septum

Overall MLS should then be determined as mean of these 3 (or 2 in case no coronal slices are available) measurements

cSDH width should always be evaluated and reported in context with cSDH volume measurements, MLS, and clinical information

MLS should always be assessed together with other parameters such as clinical information and cSDH volume

Detailed description of the used algorithms when reporting cSDH width, volume, MLS, or other quantitative radiologic measures should be provided