Can one have an mri of the plevis if one has a pacemaker? is there a risk that the leads to the heart could be damaged?

Depends on pacemaker: Some pacemakers are deemed MRI compatable while others are not. With regards to leads...Since MRI induces strong magnetic fields it was thought this could to heat generation on leads. Talk to your electrophysiologist. Great question.

Usually Not: Mris and pacemakers don't generally mix. At very specialized centers, they do MRI in patients with devices, and there is now a medtronic pacemaker system that is mri-compatible, but few patients currently have this device.