Excessive Imaging After Cancer: Doctor, Should We Get a PET Scan?
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In oncology practice, recovery means not only removing the tumor from the body but also rehabilitating the mind's unhealthy relationship with fear of recurrence. Today, many patients exchange the brief relief following each clear report for the pursuit of the next test; the literature describes this as compulsive excessive reassurance seeking . However, modern medical evidence shows that each uncontrolled additional imaging examination does not improve the chance of detecting recurrence; instead, it triggers a chain of unnecessary medical interventions called a diagnostic cascade, threatening the patient's psychological and physical integrity .
1. What Does the Literature Say? Data on Overuse
Routine imaging outside guideline recommendations in asymptomatic patients (those without symptoms) does not improve survival and multiplies the risk of complications.
Study: A longitudinal analysis of more than 15000 breast and lung cancer survivors.
Outcome: Reassurance-driven CT and PET scans performed outside routine surveillance were found to make no significant difference in the speed of detecting recurrence, but in 24% of patients they triggered a diagnostic cascade . This cascade resulted in unnecessary biopsies, hospital admissions, and major complications in 12% (such as pneumothorax after biopsy).
In addition, the Choosing Wisely (ASCO) initiative's 2025 updates ranked routine biomarker testing (CEA, CA 15-3) and advanced imaging in asymptomatic patients after early-stage breast cancer among the leading examples of low-value care.
2. The Neurobiology of Compulsive Reassurance Seeking
This is not merely excessive worry; it is an imbalance between the brain's prefrontal cortex and amygdala.
When a whole-body scan is performed, clinically insignificant nodules or cysts are detected even in 40-60% of healthy individuals. In someone with a history of cancer, these incidental findings tend to be interpreted as recurrence, initiating an unnecessary cycle of trauma lasting months.
3. Evidence-Based Surveillance: Less, but More Meaningful
Modern oncology management aims for strategic surveillance rather than a state of constant alert.
Over the next 5 years, technology itself may provide the solution to scanning dependence. ctDNA (tumor DNA in the blood) monitoring may replace radiation-intensive imaging, offering patients a continuous, passive safety net. This would create a digital reassurance model that prevents patients from actively seeking tests.
The hardest treatment in oncology is treating the adverse effects caused by an unnecessary test.
We understand our patients' very human need to seek a clear report. But scientific honesty tells us that every scan performed outside the guidelines increases the chance of complications rather than the chance of detecting recurrence. True healing means learning to interpret the body's signals (symptoms) correctly and adhering to a follow-up protocol based on trust with one's physician, rather than remaining dependent on reassurance from an external machine (PET/CT).
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