The Variant page > Related Cases section offers a Dynamic CNV overlap percentage filter as well as an Overlap column for CNVs in the data table. This percentage is computed by dividing the length of a common region between CNVs by the size of the CNV under study.
Examples of CNV overlap percentage calculation (see legend below):
Orange represents the current CNV;
Violet blue represents a previously reported CNV;
Darker shade indicates the region of overlap between the current and previously reported CNV.