Doctors Reclassified Colon Cancer After Diagnostic Surgery
A 72-year-old patient diagnosed with stage IV cancer was found to have benign abdominal granulomas instead.
Updated on Sept. 21, 2026 in Cancer
Live Poll
Do you believe medical imaging results should always be confirmed by biopsy before starting cancer treatment?
In May 2026, medical teams at the Prince of Wales Hospital determined that a patient's suspected stage IV colon cancer was actually stage III. The abdominal nodules initially mistaken for tumors were identified as inflammatory pulse granulomas caused by vegetable matter from previous bowel perforations.
Why it matters
Distinguishing between metastatic cancer and foreign body reactions is critical to prevent aggressive, unnecessary treatments. Because pulse granulomas absorb radioactive glucose tracers during PET scans, they can easily mimic malignant tumors in oncological imaging.
A PET scan showed the colon tumor had a maximum standardized uptake value of 17.3, while the benign nodules measured 9.1. Pathology confirmed these were pulse granulomas, a rare inflammatory response to vegetable matter trapped in the abdominal lining.
The players
Prince of Wales Hospital
This is a major public teaching hospital located in Randwick, New South Wales, Australia, that provides comprehensive healthcare services.
The details
The patient's history of bowel perforation allowed plant material to leak into the abdomen, triggering a foreign body reaction that appeared as stage IV disease on imaging. Surgeons performed a diagnostic laparoscopy and biopsy, which revealed glassy rings characteristic of pulse granulomas under microscopic analysis, leading to a curative surgical resection of the colon.
Timeline
The patient underwent emergency surgery for a trapped hernia in 2024.
A resection for a recurrent hernia and bowel perforation occurred in 2025.
A surveillance colonoscopy identified an ulcerated lesion in March 2026.
The patient underwent surgery to remove the left side of his colon in May 2026.
A case report regarding this diagnosis was published on September 18, 2026.
The Big Picture
This case follows the pattern established by the diagnostic challenges of pulse granulomas in oncological imaging, where non-malignant foreign body reactions mimic metastatic disease. These incidents highlight the necessity of tissue biopsy to confirm suspicious PET findings.
Patients with a history of bowel surgeries should be aware that imaging abnormalities can sometimes represent benign inflammatory reactions rather than cancer progression. This case underscores the importance of biopsy confirmation before proceeding with major medical interventions.
The takeaway
Advanced imaging like PET scans can provide misleading results when non-cancerous material mimics tumor metabolism. Physicians must integrate microscopic pathology results with imaging to ensure patients receive appropriate clinical staging.
Further reading
For more on the complexities of diagnosis, visit the Cancer section.
Live Poll
Do you believe medical imaging results should always be confirmed by biopsy before starting cancer treatment?
