Final answer:
The main risks of an MRI of the breast involve ferromagnetic metals and the powerful magnets used in MRI scanners, with high costs and patient comfort being additional concerns.
Step-by-step explanation:
Most of the risks of MRI of the breast are associated with ferromagnetic metals. MRI scanners use powerful magnets that can pose risks if the patient has any iron-containing metallic implants, as these can be dislodged or heated during the scan. The high cost of an MRI scan and the need for a shielded room are also drawbacks, aside from potential patient discomfort due to confinement in a tube-like device and noise during the procedure. Open MRI scanners mitigate some of these issues by not completely enclosing the patient. Technologist and radiologist errors are potential risks as well, but they are not the primary concerns compared to the magnetic and physical considerations of the procedure.