Has any one else had misdiagnosis and are mri always correct

[Harrods]

I had a perfusion test a few weeks ago which showed I had thickening of heart and blood wasn’t getting to part of my heart , then I went for mri to see what was the cause , they said the mri said I didn’t have thickening of heart and it wasn’t there , only the one artery which is 70 percent block which they don’t want to do anything about until they have to , has anyone else had this sort of misdiagnosis, although I am very happy not to have this thickening x