PET-CT for Ovarian Cancer: — What It Finds and What It Misses

CT is the standard scan for ovarian cancer because it reliably shows tumour size, fluid, and spread to nearby organs — the information most useful for planning surgery. PET-CT is added in specific situations where CT is not sufficient on its own. If CT was ordered, your team has what they need from it for this particular decision. You can always ask what the scan is looking for and what happens next based on the result.

Not reliably. Ovarian cancer spreads by depositing cells on the outer surface of the bowel rather than growing inside it, and these surface deposits are often too small for PET-CT to detect. This is one of the known limitations of the scan in ovarian cancer specifically, and it is why your team uses clinical examination and operative findings alongside imaging rather than relying on the scan alone.

It can. Radioactive tracer passes through the kidneys and collects in the bladder, creating a bright area that can obscure nearby pelvic structures. Your scanning team is aware of this and accounts for it in how they position and interpret the scan, but it is one reason why pelvic findings on PET-CT are always reviewed alongside CT and clinical examination rather than in isolation.

PET-CT uses ionising radiation and is not given if you are pregnant. It is not a scan that is ordered routinely or repeated without reason — your oncologist will request it when the information it provides is likely to change a treatment decision. The radiation involved is considered acceptable when the clinical reason is strong, and that is the standard your team applies before requesting it. If you have concerns about timing, raise them before the appointment.

Results are usually reported within a few days, though this depends on your centre's schedule and how urgently the information is needed. The report goes to your oncologist, who will discuss the findings with you at your next appointment or sooner if the situation requires it. If you have not heard anything within a week of the scan, contact your team to ask when to expect the discussion.

No, and this is important to understand. A PET-CT that shows no active disease does not rule out recurrence, because it cannot detect very small deposits — which is exactly how ovarian cancer often returns. If your CA-125 is rising or you are experiencing new symptoms but the scan appears clear, your team will continue to monitor you closely. The scan is one piece of information, not the final answer on its own.