The American Hospital Association/American Academy of Cardiology give
guidelines for intervention for CAD. The
guidelines are to avoid interventional procedures (stent, by-pass) for any lesion less than 70%, unless there is pain that cannot be controlled with medication. That same recommendation can be applied to lesions greater than 70%.
To state as your report does, "significant lesions" is incomplete, possibly misleading and not much help when reviewing or judging.