Hello all - has anyone had a PET (or CT/PET) diagnostic scan after chemotherapy (after rectal cancer surgery in my case) rather than an MRI? I can't have MRI scans due to a particular type of metal ear implant, so I'd appreciate views as to whether the PET scan is a good alternative. I plan to ask my oncologist at my next appointment but any views here would be helpful. I am nearing the end of a 3 month round of 'curative chemotherapy' after surgery to remove the tumour, so the next step will be to see if the treatment has worked. Thank you.
Hi BridgetHddf7f1 ,
A PET scan is useful for spotting any fast growing cells as I understand it. I have had a PET scan after chemo but it was inconclusive which I think meant they couldn't spot any areas of cancerous cells but couldn't be definite they'd all gone.
Best wishes
Cerys
Hi BridgetHddf7f1 I’ve never had a PET scan and my only MRI was to check my liver when first diagnosed. All my scans have been CT since then x
My mum had lots of PET scans as she was a stage 4 patient . It has a different method of uptake so very good at adding more information for the drs .
It would generally be the go to if they needed to clarify some other image .
Certainly would not be concerned as I think it gives a lot of information and surgeons actually quiet often ask for them when preparing for surgery too .
Take care ,
Court
Helpline Number 0808 808 0000
Hi Bridget,
I have stage IV - I regularly have CT, MRI and PET. While MRI & CT show structure, PET gives information about metabolic activity....cancer cells use more energy than normal cells, so area will 'flare' on a PET scan. Occasionally it is slightly tricky to interepret, because areas of inflammation also shows as a 'flare', so radiologist will comment accordingly. I have however had many PETs over the last 6 years, only once was it inconclusive (due to suspected inflammation in my pelvis).
Interestingly, my last recurence did not show on CT or MRI, the PET however showed a suspicious 'flare'. So they then went and did a colonocopy and found the trouble. Bottomline - PET is a good scan, I don't think you should be worried. And bonus the actual scan time is shorter than MRI. Good luck - hope its all good news!
Thank you so much for your comprehensive answer Babotie - v helpful and much appreciated.
Thank you Court, for your helpful reply, which is much appreciated - and all adds to my knowledge. Kind regards - Bridget
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2025 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007