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#410 Whole-Body MRI for Cancer Screening: Many findings, little benefit


CLINICAL QUESTION
QUESTION CLINIQUE
 What are the potential benefits and harms of performing whole-body MRI for cancer screening in asymptomatic adults?

BOTTOM LINE
RÉSULTAT FINAL
 Systematic reviews of observational studies found that 94% of patients who undergo whole-body MRI will have a radiologic abnormality and up to 30% require additional investigations. Ultimately, 1.1-1.6% will have a pathologically confirmed cancer. No data on mortality exists. Whole-body MRI for cancer screening in asymptomatic individuals should not be encouraged. 


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EVIDENCE
DONNÉES PROBANTES
  • No randomized controlled trials exist comparing patients who receive whole-body MRI to those who do not. Evidence primarily from 2 systematic reviews of cohort studies of whole-body MRI (commonly head to mid-thigh).  Pathological confirmation required for cancer diagnosis.
  • Systematic review, 10 studies (9204 adults) between 2015-2025. Patients who underwent whole-body MRI:1
    • Confirmed cancers: 1.6%.
      • Most common: prostate, renal, lung, thyroid.
    • 12% had findings requiring additional testing.
    • Higher quality studies that also included >1000 patients:2,3 Cancer detection rates ~1.2%.
  • Systematic review, 12 studies (6214 adults) between 2005-2020. Patients who underwent whole-body MRI:4
    • Confirmed cancers: 1.1%.
      • Most common: renal, prostate, lung.
    • 94% of patients had at least one finding; 30% required further investigations.
    • Studies that reported total number of findings averaged ~4.5 findings per person.
  • Limitations:
    • No mortality data available.
    • Unable to determine sensitivity/specificity or likelihood ratios, as do not know number of people who tested negative on whole-body MRI who ended up having a cancer.
CONTEXT
CONTEXTE
  • Patients who undergo whole-body MRI have higher downstream health care costs, primarily from additional imaging and speciality consultations.5
  • Time to perform whole-body MRI depends on machine, sequences captured and protocols, but typically 60-90 minutes.6,7
  • Body specific MRIs: take 20 (knee) or 30 minutes (brain):8,9
    • For every whole-body MRI, clinics could perform ~3 body specific MRIs.
  • Body-specific MRIs have greater clinical utility. Example: knee MRI for meniscal tears:10
    • Likelihood ratios (LR): positive (LR+) ~8, LR negative-~0.1: good for ruling in and almost essentially rules out meniscal tear in patients with suspected meniscal tears.
  • Organizations/guideline groups recommend against using whole-body MRI for screening asymptomatic patients.11,12

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Author(s)
Auteur(s)
  • Emily Maplethorpe MSc MD CCFP
  • Gavin Low MBChB MPhil MRCS FRCR
  • Michael R Kolber MD CCFP MSc

1. da Fonseca JM, Trennepohl T, Pinheiro LG et al. European Radiology 2025; https://doi.org/10.1007/s00330-025-11976-5.

2. Hu YS, Lin C-J, Wu C-A, et al. Cancer Imaging 2024;24:22; https://doi.org/10.1186/s40644-024-00665-z.

3. Richter A, Sierocinski E, Singer S et al. European Journal Epidemiology 2020;35:925–935.

4. Zugni F, Padhani AR, Koh DM, Summers PE, Bellomi M and Petralia G. Cancer Imaging 2020;20:34. https://doi.org/10.1186/s40644-020-00315-0.

5. Schmidt CO, Sierocinski E, Baumeister S-E et al. BMJ Open 2022;12:e056572. doi:10.1136/ bmjopen-2021-056572.

6. Mayfair Diagnostics Whole Body Imaging. Available at: https://www.radiology.ca/exam/whole-body-imaging. Accessed Jan 6, 2026.

7. PocketHealth “How long does an MRI take: The average time for each body part. Available at: https://www.pockethealth.com/patient-resources/how-long-does-mri-take. Accessed Jan 6, 2026.

8. Meijer FJA, Goraj B, Bloem BR et al. Journal of Parkinson's disease 2017;7(2): 211-217.

9. Alaia EF, Benedick A, Obuchowski NA et al. Skeletal radiology 2018;47(1): 107-116.

10. Phelan N, Rowland P, Galvin R et al. Knee Surg Sports Traum Arthrosc 2016;24: 1525–1539.

11. Canadian Association of Radiologists. Whole-Body MRI Screening in Asymptomatic Individuals: Policy Statement. 2025. https://car.ca/wp-content/uploads/2025/09/CAR-Policy-Statement-Whole-Body-MRI-Screening-in-Asymptomatic-Individuals.pdf. Accessed 23 Nov 2025.

12. Choosing Wisely: Don’t use whole-body scans for early tumor detection in asymptomatic patients.” American Academy of Family Physicians. Available at: https://www.aafp.org/pubs/afp/collections/choosing-wisely/250.html. Accessed Nov 23, 2025.

Authors have no conflicts of interest to declare.