A CT Scan foregone

Noting recent research indicating that many cancer screenings are of dubious value, Ezra Klein opines:

as long as doctors are telling scared and uncertain patients that they need to get screened, they’re getting screened. The moment they stop telling patients to get screened, screenings will plummet. In health care, doctors are really the relevant decision-makers. And right now, they don’t have the evidence to make good decisions nor the incentives to make cost-effective decisions.

That reminds me of a tale I heard told recently by a nurse midwife with many decades of experience working with doctors in hospitals -- and often tussling with them to forestall what she regards as unnecessary care, e.g., Caesarians.  She recalled a trip she took with her grandson to the emergency room after he fell out of a (stationary) truck bed, hitting his head on her driveway and getting a good-sized goose egg. She was deeply impressed with the exam that the ER physician conducted to rule out internal bleeding or risk of brain damage: her trained eye could appreciate how thorough it was. This doctor wanted  to avoid an MRI CT Scan* if all indicators were good, as they were.  That's quite unusual.