Cancer Patient Had Wrong Part of Bowel Removed After Tattoo Mix-Up in ‘Never Event’ Surgery

By sparkchronicle.com May 25, 2026 0

WALES: A cancer patient had the wrong part of their bowel removed after a surgeon reportedly mistook a tattoo marking during surgery in north Wales. Here’s what happened and why the case has sparked concern.

By Sam Khan
Published: May 25, 2026

A shocking medical error has emerged in the UK after a cancer patient reportedly had the wrong part of their bowel removed during surgery following a tattoo mix-up, in what health officials described as a “never event” — a serious medical mistake that should never happen. The incident reportedly took place at Ysbyty Gwynedd hospital in Bangor, north Wales, and has raised fresh concerns about patient safety and surgical checks within the healthcare system.

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According to a report by the Betsi Cadwaladr University Health Board, the surgeon allegedly identified a visible tattoo or internal marking and mistakenly assumed it indicated the location of the patient’s tumour. As a result, doctors removed the wrong segment of bowel, leaving the cancerous section untreated.

What Happened?

The incident occurred during surgery on a patient being treated for bowel cancer.

Medical reports suggest the surgeon relied on what appeared to be a clearly visible tattoo or marker to identify the tumour’s location. However, the marking was reportedly misunderstood during the operation.

The health board report stated:

“This led the surgeon to take out the segment of bowel that did not have the cancer in it.”

The patient has since undergone further medical investigations and is reportedly preparing for another operation to remove the correct cancerous section.

What Is a ‘Never Event’?

The incident has been classified as a “never event” — a term used by the NHS for severe, preventable medical errors that should not occur if proper safety systems are followed.

Examples include:

Wrong-site surgery
Operating on the wrong patient
Surgical instruments left inside the body
Incorrect implants
Medication errors.

According to the latest report, the bowel surgery error was one of 10 never events recorded in the last 12 months across the health board managing NHS services in north Wales.

Other Medical Errors Also Reported

The same report revealed several other serious incidents, including:

Five wrong-site procedures
Two incorrect implant cases
Two retained surgical object incidents (such as swabs left inside patients)
One case involving medicine administered through the wrong route.

Another case reportedly involved a patient receiving treatment on the wrong area after attending a suspected cancer clinic, requiring corrective surgery later the same day.

Why Are Bowel Tumours Marked With Tattoos?

In bowel cancer treatment, surgeons sometimes use medical tattoos — internal ink markings placed during colonoscopy — to help identify the exact location of tumours during surgery.

These markings are designed to make procedures safer and more accurate.

However, experts say any confusion over placement, communication, or interpretation can potentially lead to serious consequences if multiple checks are not followed.

Medical professionals typically rely on:

Scan results
Colonoscopy reports
Surgical planning notes
Team verification systems
Internal markings.

Investigation Underway

The incident is expected to be reviewed as part of a formal patient safety investigation.

Health officials are likely to examine:

Whether proper surgical protocols were followed
Communication failures before surgery
Accuracy of medical records
How the tattoo marking was interpreted.

The case is already drawing attention because “never events” are specifically meant to be preventable through established safety procedures.

Perspective

Medical errors of this nature are rare — but when they happen, they can have devastating consequences for patients already battling serious illnesses like cancer.

The fact that a patient may now require a second operation after the wrong bowel section was removed raises difficult questions about surgical safeguards and hospital accountability.

At the same time, investigations will likely determine whether this was human error, communication breakdown, or a broader systems failure.

FAQs

1. What happened in the bowel surgery case?

A surgeon reportedly removed the wrong section of a cancer patient’s bowel after mistaking a tattoo marking for the tumour location.

2. Where did the incident happen?

The operation reportedly took place at Ysbyty Gwynedd hospital in Bangor, north Wales.

3. What is a ‘never event’?

A “never event” is a serious, preventable medical mistake that should not happen if proper NHS safety procedures are followed.

4. Does the patient need more surgery?

Yes. Reports state the patient is undergoing further investigations and preparing for another operation.

5. What are bowel tattoos in surgery?

Doctors sometimes place internal tattoo markings during colonoscopies to help surgeons locate tumours accurately during bowel operations.

Final Thoughts

The north Wales bowel surgery case has become a deeply concerning example of how even small misunderstandings in medical settings can lead to major consequences.

For a patient already fighting cancer, undergoing the wrong operation adds physical and emotional trauma — while also putting renewed focus on the importance of hospital safety systems and surgical precision.