Up to one in 20 people with high blood pressure could have their condition cured or dramatically improved thanks to a new 10-minute scan.
While around a third of adults in the UK have high blood pressure, for most the cause is unknown and the condition requires lifelong treatment with drugs.
But in one in 20 cases, the condition is caused by aldosterone, a steroid hormone produced by tiny nodules in the adrenal glands just above the kidneys.