Radiology Misdiagnosis Claims in Ireland: When a Scan Error Causes Real Harm

What counts as radiology misdiagnosis in Ireland?

According to the State Claims Agency ^[1], 93% of radiology-related claims in Ireland involve missed diagnoses. Radiology misdiagnosis occurs when a healthcare professional responsible for interpreting medical images fails to identify, correctly classify, or adequately report a finding, and that failure results in patient harm. Under Irish law, not every radiology error amounts to negligence. The Dunne principles require proof that the error fell below the standard of a reasonably competent radiologist acting with ordinary care.

The distinction matters in practice. A subtle lung nodule missed on a busy overnight shift might fall within the range of acceptable error. A clearly visible 3cm mass on a well-exposed chest X-ray, missed despite adequate viewing conditions, is harder to defend. The line between a defensible discrepancy and actionable negligence depends on what an independent peer reviewer would conclude when viewing the same images.

The SCA's five-year review of 58 finalised radiology claims (2016 to 2020) found that contributory factors included misinterpretation of imaging findings, failure to consider a differential diagnosis, and failure to recognise all fractures where multiple fractures were present. ^[1]

How do radiology errors happen? The five-type taxonomy

Radiology errors in Ireland fall into distinct categories, each carrying different legal weight. The State Claims Agency ^[1] and published research in the Ulster Medical Journal (Brady, 2012) ^[6] identify five principal types. We call this the Five-Gate Error Framework because a scan must pass through each of these gates before a diagnosis reaches your treating doctor.

A detail that catches many claimants off guard: the radiologist's duty doesn't end at typing the report. Under Irish hospital practice and the National Radiology Quality Improvement Guidelines ^[16], critical findings (suspected cancer, cord compression, aortic emergency) require direct verbal communication to the referring doctor. Failure to close that communication loop is a distinct source of liability, even when the written report is correct.

Incidental findings: the follow-up gap

One aspect official guidance doesn't cover in enough detail: incidental findings, sometimes called incidentalomas. When a CT ordered for abdominal pain reveals an unrelated lung nodule or renal mass, the radiologist has a duty to flag the incidental finding and the hospital has a duty to ensure follow-up. If a 12mm lung nodule is noted in the report but nobody tracks it and the patient develops lung cancer 18 months later, the liability may fall on the hospital's tracking system rather than the reporting radiologist. Incidentaloma follow-up failures are a growing category in Irish radiology claims because they sit in a gap between the radiologist's report and the referring clinician's action plan.

The HSE's own assistant national director has acknowledged that errors and discrepancies in radiology are "uncomfortably common," with an estimated day-to-day rate of 3 to 5%. Irish Examiner (August 2025) ^[2]. That baseline rate isn't negligence. The next step is to understand the legal test that separates an acceptable discrepancy from actionable negligence under Irish law.

What legal test applies to radiology negligence in Ireland?

According to the Supreme Court in Dunne v National Maternity Hospital [1989] ILRM 83, the standard of care for all medical negligence claims in Ireland is set by the Dunne principles. A radiologist isn't negligent simply because they made an error. The plaintiff must prove the error was one that "no medical practitioner of equal specialist or general status and skill would be guilty of if acting with ordinary care," as outlined by Hayes Solicitors LLP ^[4].

Unlike in England and Wales, where the Bolam/Bolitho test applies and a defendant doctor can be defended by any responsible body of medical opinion, the Irish Dunne test allows the court to reject medical opinion that is not logically supportable. That's a critical distinction for radiology claims. An Irish court can find negligence even if a defence expert defends the interpretation, provided the court considers that defence illogical or unsupported by the evidence.

How Irish law differs from English and Welsh law

If you've read UK-based guidance on radiology claims, note the shorter Irish limitation period and the different standard of care test. The differences in loss of chance and pre-action procedure also affect case strategy.

In practice, radiologists are judged against the standard of a consultant radiologist working in the same subspecialty. A musculoskeletal radiologist's interpretation of bone scans is measured against peers in that field, not a general radiologist reading the same images. Expert evidence from an independent consultant radiologist is required in every case.

How Crumlish v HSE (2024) changed causation rules for scan claims

The 2024 Court of Appeal decision in Crumlish v Health Service Executive [2024] IECA 244 raised the bar for proving causation in radiology cancer claims in Ireland. The court dismissed the plaintiff's appeal, holding she failed to prove a breast tumour was detectable on imaging five months before diagnosis, as reported by the Irish Times (October 2024) ^[7].

The plaintiff's oncology expert relied on a theoretical "45-day tumour doubling time" from a 1993 academic paper to argue the cancer must have been visible at an earlier scan. Both the High Court (Ms Justice Gearty) and the Court of Appeal (Mr Justice Noonan) rejected this approach. The court found the doubling-time evidence was result-driven rather than scientifically reliable. Just because a tumour was present at the time of the earlier scan did not prove it was detectable on that scan.

Defence teams now routinely invoke what radiologists call the "retroscope" argument: a finding may appear obvious now because the reviewer already knows where to look. To counter this, plaintiff solicitors increasingly commission a "blind peer review," where an independent radiologist reviews the original scans without knowing the later outcome. The difference between winning and losing these cases often comes down to whether that blind review identifies the missed lesion prospectively. At this point, the question becomes which scan types generate the strongest claims.

What if earlier detection wouldn't have saved the patient?

Crumlish addresses whether the abnormality was detectable. A separate causation problem arises when it clearly was detectable but the patient's prognosis was poor regardless. In Philp v Ryan [2004] IESC 105, the Supreme Court held that a patient negligently deprived of a timely prostate cancer diagnosis could recover damages for the lost opportunity to discuss and decide on treatment, even though it was uncertain whether earlier treatment would have extended his life. The court awarded €100,000, including €50,000 in aggravated damages after the defendant doctor falsified his clinical notes to conceal the missed diagnosis.

Unlike in England and Wales, where the House of Lords rejected loss of chance in medical negligence in Gregg v Scott [2005], Irish law recognises this as a compensable head of loss. For radiology claimants, the practical effect is significant: even if a missed lung nodule or delayed cancer diagnosis didn't provably shorten your life, you can claim for the period during which you were denied the chance to make informed treatment decisions. The Philp decision also carries a warning for defendants. If a hospital amends a radiology report, backdates an addendum, or alters PACS metadata after a complaint, that conduct could attract aggravated damages on top of the underlying claim.

Which scan types produce the most claims in Ireland?

X-ray: missed fractures

Plain film radiography (X-ray) generates the highest volume of radiology negligence claims in Ireland, typically arising from Emergency Departments. The SCA review found that failure to recognise all fractures where multiple fractures were present was a specific contributory factor ^[1].

Scaphoid wrist fractures are notoriously difficult to spot on initial films. A failure to order dedicated scaphoid views when clinical suspicion exists, or to treat the wrist as a presumed fracture pending repeat imaging at 10 to 14 days, is a specific breach of duty. If missed, the scaphoid's poor blood supply can lead to avascular necrosis and permanent disability.

Hip fractures in elderly patients follow a similar pattern. Osteopenia can obscure hairline fracture lines on standard X-rays. When an older patient presents unable to bear weight after a fall but the X-ray appears normal, the standard of care in Ireland requires an MRI. Sending that patient home without further imaging is a frequent basis for claims.

CT and MRI: cancer, stroke, and spinal emergencies

Cross-sectional imaging claims tend to involve higher damages because the missed conditions are often catastrophic. Missed metastases on CT staging scans can lead to incorrect cancer staging and inappropriate treatment decisions. A patient might undergo surgery for a primary tumour when a missed liver metastasis means the cancer was already incurable.

Failure to order or correctly interpret an urgent MRI for suspected cauda equina syndrome (when a patient presents with saddle anaesthesia or bowel/bladder dysfunction) remains a major area of litigation. In stroke cases, missing early ischaemic signs on a CT brain scan, such as the dense vessel sign or loss of grey-white differentiation, can mean the patient misses the critical window for thrombolysis (clot-dissolving treatment).

Mammography and ultrasound

Following the Crumlish decision and the broader context of the CervicalCheck and BreastCheck controversies in Ireland, breast imaging claims require particular care with causation evidence. Dense breast tissue in younger women can reduce mammogram sensitivity. Negligence may arise from a failure to order supplemental ultrasound when the mammogram is equivocal or sensitivity is limited. Misclassifying suspicious micro-calcifications as benign when they indicate ductal carcinoma in situ (DCIS) is a specific interpretative error that carries significant legal exposure.

When does the time limit start for a missed scan?

The general limitation period for personal injury claims in Ireland is two years under the Statute of Limitations (Amendment) Act 1991 ^[3]. For radiology claims, the clock typically starts from the "date of knowledge," not the date of the scan itself. We call this the Date-of-Knowledge Discovery Test: the date you first knew, or ought reasonably to have known, that your injury was attributable to the scan error.

Radiology misdiagnosis often involves a significant discovery gap. A CT scan might be reported as normal in 2023. In 2026, a follow-up scan reveals cancer that was visible on the 2023 images. The two-year clock runs from 2026 (the point of discovery), not from the original 2023 scan. One aspect the official guidance doesn't cover: determining the exact "date of knowledge" can itself become contested. If a GP received an abnormal report but didn't communicate it to you, the legal question becomes when you personally had enough information to connect the injury to the earlier scan. The Date-of-Knowledge Discovery Test turns on that exact question.

This leads to the question of what evidence you actually need to prove a radiology claim once you decide to proceed.

What evidence do you need to prove a radiology claim?

The State Claims Agency ^[1] identifies expert radiology review as the critical evidence in Irish claims. Proving a radiology misdiagnosis claim in Ireland requires three elements: breach of duty, causation, and quantifiable injury. Each must be supported by expert evidence from a consultant radiologist who is independent of the treating hospital. A GP or oncologist cannot provide the specialist radiology opinion needed to establish breach.

The expert will apply the Five-Gate Error Framework through a retrospective review of your original imaging. In stronger cases, solicitors commission a blind peer review where the expert views the scans without knowing the diagnosis, to test whether the abnormality would have been identified prospectively. The timing matters more than most guides suggest: obtaining the original PACS images (the actual digital files, not just the written report) is essential because the printed report may understate what was visible on screen.

Alongside the radiology expert, you typically need a report from the relevant treating specialist (oncologist, orthopaedic surgeon, neurologist) to establish causation: that the delay in diagnosis made a material difference to your outcome. After Crumlish, this causation evidence must be concrete and based on what was actually detectable on the images, not on theoretical growth models.

What the timeline estimates don't account for: sourcing independent radiology experts for Irish cases often means engaging UK-based consultants to ensure no conflict of interest within the small Irish radiology community. This can add 8 to 12 weeks to the investigation phase. The next step is to secure your imaging records before you instruct any expert.

How to access your radiology images (PACS records)

Your radiology images are stored digitally on the hospital's Picture Archiving and Communication System (PACS). Under GDPR Article 15, you have a right to access your personal data, including these images. Hospitals in Ireland must respond within one calendar month.

The written radiology report alone is not sufficient for a negligence claim. You need the actual DICOM image files (typically provided on disc or via secure download) because the expert must review the original images at full resolution, not a summary interpretation. When requesting records, specifically ask for "all PACS imaging data including original DICOM files for [body area] from [date range]." The National Integrated Medical Imaging System (NIMIS), operated by eHealth Ireland ^[8], connects imaging across 48 Irish public hospitals, though access procedures vary by institution.

Who is liable: the radiologist, the hospital, or both?

According to the State Claims Agency ^[1], which manages all clinical negligence claims against public healthcare providers, both the individual radiologist and the employing institution (typically the HSE or a private hospital) can be held liable in Ireland. The HSE carries a non-delegable duty of care towards patients treated in its facilities. The SCA paid out over €210 million in clinical care damages in 2024.

For private hospital claims, the defendant is the hospital and/or the individual radiologist's medical indemnity insurer. The legal standard of care is identical in public and private settings. The practical difference is procedural: SCA-managed claims tend to settle later in the process but at a high rate (over 97% without a court ruling), while private insurer timelines vary.

Since October 2022, HIQA ^[18] has held regulatory responsibility for clinical audit of all radiological procedures in Ireland under SI 256/2018. Their November 2024 inspection programme found that only four facilities achieved full compliance with the new audit requirements. Where a hospital hasn't implemented HIQA-mandated radiology quality audits, a claimant's solicitor can argue this represents systemic failure in oversight, strengthening a claim that the error wasn't an isolated lapse but the product of inadequate departmental governance.

Outsourced scans: who is responsible when your images are read abroad?

Teleradiology has become widespread in Irish hospitals, with overnight and weekend scans increasingly reported by radiologists based outside Ireland. A significant proportion of overnight and weekend scans in Irish hospitals are reported by radiologists based in the UK, Australia, or elsewhere. This creates a complex liability question.

If a teleradiologist based abroad misreads your scan taken in a Dublin hospital, the HSE typically remains the primary defendant under the principle of non-delegable duty. The litigation may also involve the teleradiology company under third-party proceedings. The Letterkenny University Hospital locum controversy in 2023, where a locum radiologist's work was found to have a 37% error rate, highlighted the risks of over-reliance on temporary or outsourced radiology staff. Irish Times (October 2023) ^[17]

One detail that surprises clients: even where the teleradiology firm is based outside Ireland, Irish courts can assert jurisdiction over the claim because the scan was taken and the patient treated in an Irish hospital. The defendant hospital cannot shift responsibility simply by pointing to its outsourcing arrangement.

Does AI in radiology change who is responsible?

Irish hospitals increasingly use artificial intelligence tools to flag potential abnormalities on scans, a process called Computer Aided Detection (CAD). Under current Irish law and the Dunne principles, the human radiologist retains full responsibility for the final interpretation. "The computer missed it" isn't a defence to a negligence claim.

An emerging question arises when AI correctly flags an abnormality but the radiologist overrides or dismisses the alert. Research suggests that juries may judge radiologists more harshly when they disagreed with an AI system that turned out to be correct. For claimants, this creates a potential line of enquiry: whether the radiologist received and reviewed any AI-generated alerts before signing off the report. While no Irish court has yet ruled specifically on AI-assisted radiology negligence, the Dunne framework is broad enough to encompass it. The human remains the gatekeeper.

What compensation applies to radiology misdiagnosis in Ireland?

Compensation in radiology misdiagnosis claims in Ireland is assessed under the Judicial Council Personal Injuries Guidelines (2021) ^[9] for general damages (pain, suffering, and loss of amenity). Special damages cover actual financial losses: medical expenses, loss of earnings, rehabilitation costs, and future care needs.

Awards vary enormously depending on the injury caused by the delay. A missed fracture that heals after additional treatment may attract modest general damages. A missed cancer diagnosis that leads to advanced-stage disease, more aggressive chemotherapy, or reduced life expectancy involves substantially higher awards. The Guidelines provide ranges by injury type, but every case turns on its own facts.

The SCA's total clinical care damages in 2024 came to €210.5 million, down from €275.9 million in 2023. Of the 2,593 clinical care claims finalised between 2021 and 2024, just 35 (about 1%) proceeded to a court ruling. The overwhelming majority settled. Irish Examiner (April 2025) ^[13]

All compensation figures are case-specific. The Judicial Council Personal Injuries Guidelines 2021 provide indicative ranges, but actual awards depend on individual circumstances, severity of injury, and proven losses.

Complaint pathways before or alongside a claim

Under the HSE's Your Service Your Say framework ^[10], a formal legal claim isn't the only route available in Ireland. The HSE complaints process, Medical Council referral, and open disclosure obligations under the Patient Safety Act 2023 all run alongside litigation.

HSE complaints process. You can make a formal complaint through HSE Your Service Your Say ^[10]. This can produce an investigation, an apology, and recommendations for changes. It does not result in financial compensation.

Medical Council. If you believe the radiologist's conduct raises fitness-to-practise concerns, you can complain to the Medical Council of Ireland ^[11]. This regulatory route addresses the doctor's registration, not compensation.

Patient Safety (Notifiable Incidents and Open Disclosure) Act 2023. Since September 2024, hospitals must notify patients of certain serious incidents and engage in open disclosure. If your radiology error qualifies as a notifiable incident, the hospital has a legal obligation to inform you.

The clinical audit privilege trap. The same Act ^[19] grants legal protection to information created during clinical audits. If a hospital's internal radiology peer review identified your missed diagnosis, that audit report can't be used as evidence in your negligence claim, as admission of fault, or in fitness-to-practise proceedings. The practical effect is a paradox: the hospital's own audit may have confirmed the error before you even discovered it, but the audit evidence itself is shielded from litigation. Your solicitor must build the case independently through your own expert review of the original PACS images, not through the hospital's internal quality process. This makes early access to your DICOM files (covered above) even more critical.

The IRB does not apply. The Injuries Resolution Board (IRB), formerly known as the Personal Injuries Assessment Board (PIAB) until 2023, does not handle medical negligence claims. Unlike standard personal injury cases (car accidents, workplace injuries) which must go through the IRB first, medical negligence actions in Ireland proceed directly through the courts. This is a common source of confusion.

Self-audit: could your scan error be negligence?

Not every missed finding amounts to negligence under Irish law. Use the Five-Gate Error Framework and these five questions as an initial guide before seeking legal advice.

This self-audit provides general guidance only and does not constitute legal advice. Every case is different.

Common questions about radiology misdiagnosis claims in Ireland

What to consider next

These follow-up scenarios arise frequently in Irish radiology claims. SCA data ^[1] confirms that communication failures are a distinct liability category.

What if my GP received an abnormal report but didn't tell me? The liability may shift from the radiologist to the GP or the referring hospital. A communication error, where the report was accurate but no follow-up was taken, is a distinct claim pathway. Your solicitor will need to establish who received the report, when, and what follow-up was or was not initiated.

What about scans reported by a sonographer rather than a radiologist? Ultrasound scans in Ireland are often performed and reported by sonographers (radiographers with additional training) rather than consultant radiologists. The legal standard of care for a sonographer is measured against a "reasonable sonographer," though in practice Irish courts apply the same competence threshold for the specific task performed.

Can I claim if the error was found during a hospital audit or recall? Yes. Hospital radiology audits and recalls (such as those following the Letterkenny locum reviews) sometimes identify errors before patients develop symptoms. If the error caused a delay in diagnosis that worsened your condition, the fact that the hospital discovered it through its own quality processes does not remove your right to claim. It may, in some cases, strengthen it.

References

1. State Claims Agency, "Learning from Radiology Claims" (2022)
2. Irish Examiner, "Mistakes in reading medical scans have led to deaths" (August 2025)
3. Civil Liability Act 1961 (as amended), Irish Statute Book
4. Hayes Solicitors LLP, "Dunne Principles in Medical Negligence" (2024)
5. Citizens Information, "Injuries Resolution Board" (2025)
6. Brady AP, "Error and Discrepancy in Radiology: Inevitable or Avoidable?," Ulster Medical Journal / PMC (2017)
7. Irish Times, "Crumlish v HSE: Woman loses bid for retrial" (October 2024)
8. eHealth Ireland, NIMIS Overview (2025)
9. Judicial Council, Personal Injuries Guidelines (2021)
10. HSE, "Your Service Your Say" Complaints (2025)
11. Medical Council of Ireland (2025)
12. Law Society of Ireland (2025)
13. Irish Examiner, "State Claims Agency pays out more than €1.4bn in settlements" (April 2025)
14. Health Service Executive (2025)
15. Civil Liability and Courts Act 2004, Section 8, Irish Statute Book
16. Faculty of Radiologists RCSI, National Radiology QI Guidelines (2015)
17. Irish Times, "Review of hundreds of scans at Letterkenny after 37% error rate" (October 2023)
18. HIQA, Regulation of Medical Exposure to Ionising Radiation (Updated 2024)
19. Patient Safety (Notifiable Incidents and Open Disclosure) Act 2023
20. Philp v Ryan [2004] IESC 105, [2004] 4 IR 241 (Supreme Court of Ireland, Fennelly J)