Colon Cancer Diagnosis Was Actually Benign Nodules
A 72-year-old patient avoided a stage IV cancer diagnosis after biopsy revealed abdominal nodules were not tumors.
Updated on Sept. 21, 2026 in Cancer
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In May 2026, medical teams reclassified a 72-year-old man's colon cancer from stage IV to stage III after discovering that his abdominal nodules were benign reactions to vegetable matter. This finding allowed clinicians to shift from palliative management to curative surgery.
Why it matters
This case illustrates the importance of histological verification in imaging-based cancer staging, as inflammatory conditions can mimic metastatic disease on PET scans. It highlights how previous bowel trauma can create unique diagnostic challenges.
A clinical case report documented a 72-year-old patient whose abdominal nodules showed a maximum standardized uptake value of 9.1 on PET imaging. Pathology confirmed these were pulse granulomas, preventing a stage IV cancer misdiagnosis.
The players
Prince of Wales Hospital
The Randwick, Australia medical facility where the patient was treated and the study authors are based.
The details
Pulse granulomas form when plant material escapes the digestive tract due to past bowel perforations, triggering a foreign body response. These inflammatory lesions contain giant cells and glassy rings, which can erroneously absorb the radioactive glucose tracers used in PET scans. Because these tracers highlight metabolically active tissue, clinicians often misidentify these inflammatory spots as metastatic tumors.
Timeline
2024: Patient underwent emergency surgery for a trapped hernia.
2025: Patient underwent resection for recurrent hernia and perforation.
March 2026: Surveillance colonoscopy found an ulcerated lesion.
May 2026: Patient underwent surgery to remove part of the colon.
September 18, 2026: Case report was published in a medical journal.
Health Landscape
This case highlights the ongoing challenge of PET scan false positives, where inflammatory processes interfere with diagnostic accuracy. It serves as a reminder of how atypical medical histories can complicate standard oncological staging protocols.
If you have a history of bowel surgeries or perforations, discuss the implications for future imaging accuracy with your oncology team. Always confirm that suspicious nodules seen on PET scans are biopsied if their status remains unclear.
The takeaway
Inflammatory conditions can sometimes mimic the appearance of metastatic cancer on PET scans, particularly in patients with previous bowel trauma. Patients should maintain open communication with their surgeons about their complete surgical history to assist in accurate diagnostic interpretation.
Further reading
For more on diagnostic challenges, visit our Cancer section.
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