Radiologists read thousands of imaging studies per year, working under productivity pressures that many academic analyses have linked to increased error rates. A missed pulmonary embolism on CT, a misread intracranial bleed on head CT, an overlooked lung nodule on a routine chest film, or a fracture called negative on plain X-ray are injuries that are largely avoidable, traceable to a specific act of omission, and documentable through the imaging record itself. Radiology malpractice cases are distinctive because the evidence of what the radiologist should have seen is permanently captured in the digital imaging file, available for retrospective expert review without degradation.
The Radiology Standard of Care
The American College of Radiology (ACR) publishes Practice Parameters and Technical Standards that define appropriate imaging protocols, interpretation procedures, report turnaround times, and communication standards for critical findings. These documents define the applicable standard of care in the same way that specialty society guidelines define the standard in surgical and procedural specialties. An expert witness in a radiology malpractice case must be familiar with the ACR standards relevant to the imaging modality and clinical context at issue.
Two features of the radiology workplace are particularly relevant to the breach analysis. First, workload volume: academic studies have documented that radiologist error rates increase with daily read volume above certain thresholds, and that facilities with productivity-based compensation models incentivize read volume in ways that affect attention and error frequency. Documents reflecting the radiologist's daily read volume on the date of the misread, and the facility's productivity standards, are relevant discovery targets. Second, subspecialty expertise: a general radiologist reading a neuroradiology study, or a teleradiologist reading an unfamiliar study type outside their training, may be held to the standard of the specialist whose expertise was required by the complexity of the case.
Common High-Risk Imaging Misses
The imaging miss cases that generate the most serious harm typically involve time-sensitive diagnoses where early detection changes the outcome materially:
- Pulmonary embolism on CT pulmonary angiography (CTPA): PE is a common and frequently missed finding, particularly in central and peripheral vessel distributions. The ACR requires systematic review of all pulmonary arterial segments, and a report that fails to identify a filling defect visible in retrospect on the CTPA is the most common form of PE imaging malpractice.
- Intracranial hemorrhage on head CT: subdural, epidural, and subarachnoid hemorrhages require specific window and level settings for optimal visualization. A radiologist who failed to apply appropriate window settings, or who dismissed a subtle finding as artifact, may have missed a treatable hemorrhage in a patient who subsequently deteriorated.
- Vertebral fractures on plain radiographs or CT: compression fractures and transverse process fractures are frequently missed on initial reads, and the missed fracture may be the first sign of a pathologic fracture from metastatic disease.
- Lung nodules on chest CT: the Fleischner Society guidelines define follow-up protocols for pulmonary nodules by size and morphology. A radiologist who fails to identify a nodule that was present on a prior study, or who fails to recommend appropriate follow-up for a nodule that was identified, has deviated from a well-documented standard that the expert can address directly from the guideline text.
The Referring Physician Duty Chain
The radiologist's legal duty in most jurisdictions runs to the ordering or referring physician rather than directly to the patient. The radiologist interprets the study and communicates findings to the ordering provider, who is then responsible for integrating those findings into the patient's care. This duty chain creates a liability picture where both the radiologist and the referring physician may be responsible for the missed diagnosis: the radiologist for failing to identify or communicate the finding, and the referring physician for failing to act on a finding that was communicated or for failing to order appropriate imaging in the first place.
For critical findings, the ACR and most hospital policies require the radiologist to directly communicate the result to the ordering clinician by phone, not merely to file an electronic report. A critical finding (intracranial hemorrhage, tension pneumothorax, aortic dissection) that was placed in an electronic report without direct physician notification is a communication failure that is separate from the question of whether the finding was correctly identified in the first place.
Teleradiology and Multi-Institution Liability
The growth of teleradiology, in which imaging studies are read by radiologists at remote locations, often overnight or on weekends, creates additional liability complexity. A study read by an out-of-state teleradiology group is subject to the standard of care of the state where the reading radiologist is licensed, the state where the patient was treated, or potentially both, depending on the applicable choice-of-law rule. The teleradiology group itself is typically a corporate entity that may be a separate named defendant from the individual radiologist. Obtain the reading radiologist's credentials, the teleradiology company's quality assurance records, and any prior critical event reports involving the same reading radiologist.
Causation: Loss of Chance in Imaging Miss Cases
The most common causation challenge in radiology miss cases is that the patient's outcome was already determined by the underlying disease and that earlier detection would not have changed the result. The loss-of-chance doctrine addresses this: in states that recognize it, a plaintiff need not prove that the timely diagnosis would have produced a cure, only that it would have provided a meaningful statistical probability of a better outcome. A lung cancer patient whose tumor was first visible on a chest CT read three years before it was finally diagnosed may not be able to prove that earlier detection would have produced a cure, but can likely prove through oncology expert testimony that the three-year delay reduced the statistical probability of survival from 60 percent to 15 percent, with the lost 45 percentage points as the compensable loss of chance.
The expert in a loss-of-chance radiology case must be qualified in the relevant clinical specialty (oncology for missed cancer cases, neurology for missed stroke cases) as well as in radiology, because the causation opinion requires both the statement of what the timely diagnosis would have shown and the statement of what the clinically appropriate treatment would have been and its expected outcome. For the wrongful death damages framework when a radiology miss results in a preventable death, see wrongful death practice. For verdict benchmarks in radiology malpractice cases, including settlement data for missed cancer and missed PE cases, see case law and settlements. For the medical expert witness development workflow in diagnostic error cases, see medical malpractice practice coverage.