PET-CT for Testicular Cancer: — The Seminoma Exception

Not for the same decision. In non-seminomatous germ cell tumours, guidelines generally recommend surgical removal of residual masses regardless of the PET result, because those tumours can contain mature teratoma that does not take up FDG but still needs to come out. The scan does not change the management plan in the same way as it does for seminoma. Your oncologist will explain which type of germ cell tumour you have and what that means for your follow-up.

ESMO and NCCN both describe PET-CT as the recommended imaging tool for this specific clinical situation, and the evidence base is more established than for most other PET uses in urology. That said, no scan is definitive. A small proportion of results are uncertain or inconclusive, and your oncologist will always interpret the scan in the context of your tumour markers, original stage, and the size of the mass — never on the PET result alone.

Tumour markers — including AFP, beta-hCG and LDH — are proteins measured in a blood test that can signal cancer activity. If your markers are still elevated after chemotherapy, that changes the interpretation of any scan result, because elevated markers already indicate active disease. Your oncologist will check markers before deciding whether and when to arrange a PET scan, and a rising marker during surveillance may prompt imaging even before the CT shows a change.

Normal tumour markers with a persistent visible mass on CT is exactly the situation where PET-CT is most useful for seminoma. CT cannot distinguish between scar tissue and viable tumour, and normal markers alone do not answer that question. Whether a PET scan is indicated in your specific case depends on the size and characteristics of the mass — your oncologist will explain the criteria they are applying.

PET-CT is available through partner imaging centres coordinated across CION's network in Telangana and Andhra Pradesh. CION does not own PET-CT scanners directly but arranges access to accredited imaging facilities. Your oncologist will organise the referral and make sure the scan is timed correctly after your chemotherapy ends.

Preparation typically involves fasting for several hours before your appointment and avoiding strenuous physical activity, because muscle glucose uptake from exercise can affect how the scan reads. After the radiotracer injection you will rest for about an hour before the scan itself, which usually takes around half an hour. Your imaging centre will give you specific instructions for your appointment, including any dietary restrictions.