But MRI also had disadvantages compared to mammography.
The biggest one is its cost which I’ll come back to at the end.
There are more false positives resulting in repeat imaging and unnecessary biopies.
Biopsies under MRI guidance are technically more difficult than with mammography or ultrasound and may not be available at the facility that does the imaging. Some centres may do needle localization for surgical biopsies but not core biopsies.
There are some nuisance logistics. To optimize sensitivity and specificity the study should be done in the 2nd week of the woman’s menstrual cycle.
Very large women don’t fit into the magnet and there are the usual MRI restrictions on indwelling metal objects.

About 5 to 10% of women get so claustrophobic that they require mild sedation and here’s why.