Lvrf 63% perfusion imaging notable for moderate sized, moderate intensity inferolateral perfusion defect without significant reversibility. is this serious?

Defects in perfusion imaging without reversibility is usually interpreted as evidence of prior heart attack related scar. However, a number of factors could cause an apparent perfusion defect without prior heart damage. These may include artifacts due to motion, attenuation due to other structures causing apparent “defects”. Your cardiologist should be able to interpret this finding better.