This scale classifies the morphology of aneurysm remnants into five grades: 

I - <50% of neck size; 

II - >50% of neck size; 

III - residual lobe of a multi-lobulated sac; 

IV - residual portion of sac <75% of aneurysm size; 

V - residual portion of sac >75% of aneurysm size
((Sindou M, Acevedo JC, Turjman F. [[Aneurysm]]al [[remnant]]s after microsurgical [[clipping]]: [[classification]] and results from a prospective angiographic [[study]] (in a consecutive series of 305 operated [[intracranial aneurysm]]s). Acta Neurochir (Wien). 1998;140(11):1153-9. doi: 10.1007/s007010050230. PMID: 9870061.)).