Why is ultrasound used as the scan of choice to diagnose ovarian cancer as opposed to other types of scan such as a MRI or CT scan?
Transvaginal ultrasound (internal ultrasound) has been identified by doctors as the most effective type of scan to use as part of the diagnostic process for ovarian cancer, as set out in National Institute for Health and Care Excellence (NICE) guidelines - https://www.nice.org.uk/Guidance/cg122. Other benefits include the fact that it is widely available for GPs to access quickly and it is not harmful as there is no radiation from an ultrasound scan.
Following a transvaginal ultrasound, if a further scan is needed, a CT would be arranged by the hospital doctor. MRI is not used as a scan for the peritoneal cavity as the pictures are not reliable.