CBCT Incidental Findings: What Referring Clinicians Need to Know

CBCT incidental findings are pathological or anatomical abnormalities discovered beyond the primary clinical question that prompted the scan. Research consistently shows that up to 80% of dental CBCT examinations reveal at least one incidental finding. In fact, the average is 2.6 findings per scan. For referring clinicians, understanding these findings is essential for patient safety and medico-legal compliance.

This article explains the most common categories of CBCT incidental findings. It also covers your responsibilities under IR(ME)R 2017. Additionally, it describes how structured radiology reporting at 3Beam ensures that every finding receives appropriate clinical attention.

Quick Answer: Why Do CBCT Incidental Findings Matter?

A CBCT scan captures volumetric data across a field of view that extends well beyond the target region. Consequently, the dataset frequently reveals pathology in the paranasal sinuses, cervical spine, or airway. Published data indicates that approximately 39% of these findings require active treatment. Furthermore, an additional 25% require follow-up imaging. Ignoring these findings exposes both the patient and the referring clinician to avoidable risk.

How Common Are CBCT Incidental Findings?

A 2022 study published in Diagnostics examined 370 dental CBCT scans. The researchers identified 974 incidental findings, affecting 78.6% of all scans. On average, each examination contained 2.6 incidental findings. Similarly, a systematic review and meta-analysis reported a pooled prevalence of 69.1% across multiple study populations.

These figures are remarkably consistent across different clinical settings. Whether the scan was requested for implant planning, endodontic assessment, or orthodontic evaluation, the probability remains high. Therefore, every CBCT examination demands a thorough review of the entire captured volume.

Categories of CBCT Incidental Findings

Incidental findings in dental CBCT examinations fall into several well-defined categories. Understanding these categories helps referring clinicians anticipate what a comprehensive radiology report may contain. More importantly, it clarifies how each finding influences patient management.

Dental pathology (55% of all incidental findings)

This is the most frequently encountered category. It includes periapical pathology in teeth adjacent to the region of interest, previously undetected caries, root resorption, and retained root fragments. For example, a CBCT requested for implant planning at site 36 may reveal a periapical radiolucency at 35. This finding would not have been apparent on the pre-operative OPG. Similarly, odontogenic cysts and tumours are sometimes first identified as incidental findings.

Paranasal sinus and airway findings (29%)

Mucosal thickening, mucous retention cysts, polyps, and sinus opacification are among the most common non-dental findings. In particular, odontogenic sinusitis is frequently identified when the field of view includes the maxillary sinus floor. Additionally, airway narrowing suggestive of obstructive sleep apnoea may appear on scans that capture the oropharyngeal region. Research from the European Society of Radiology confirms that sinus pathology accounts for nearly a third of all incidental observations.

Osseous pathology (15%)

Bone-related findings include osteoporotic changes, fibrous dysplasia, and cemento-osseous dysplasia. Cervical spine anomalies also fall into this category. Specifically, degenerative disc disease, vertebral body irregularities, and calcified stylohyoid ligaments (Eagle syndrome) appear here. These findings often require onward referral to medical specialists.

Vascular calcifications

Carotid artery calcifications appear on approximately 9% of CBCT scans that include the cervical region. While these calcifications do not confirm clinically significant atherosclerosis, they serve as an important indicator. Consequently, they warrant referral to the patient’s GP for cardiovascular risk assessment. Notably, identifying these calcifications can be genuinely life-saving.

Temporomandibular joint findings

TMJ-related incidentals include condylar remodelling, osteophyte formation, and joint space narrowing. These findings are particularly relevant when the original scan was not requested for TMJ assessment. In such cases, they may explain symptoms the patient has not yet reported to their dentist.

Your Medico-Legal Responsibilities Under IR(ME)R 2017

The Ionising Radiation (Medical Exposure) Regulations 2017 impose specific duties on clinicians involved in CBCT imaging. Importantly, these regulations require that a suitably trained clinician evaluates the entire CBCT volume. This obligation extends beyond the region specified in the referral.

In practice, the clinician who interprets the scan bears responsibility for identifying all pathology within the field of view. Failure to report an incidental finding that later proves significant could constitute a breach of duty of care. Furthermore, the FGDP (now College of General Dentistry) Selection Criteria for Dental Radiography recommends that all CBCT examinations receive a formal written report. This report should come from a clinician with appropriate training in dental and maxillofacial radiology.

Additionally, the SEDENTEXCT guidelines from the European Academy of Dentomaxillofacial Radiology (EADMFR) state that clinical evaluation must extend to all captured structures. This applies regardless of the primary indication for the scan. This is not optional guidance; it represents the standard of care.

Why Structured Reporting Captures What Ad Hoc Review Misses

The difference between finding an incidental abnormality and missing it often comes down to reporting methodology. Ad hoc review carries a significant risk of overlooking pathology. In this approach, a clinician scrolls through the dataset looking primarily at the area of interest. In contrast, structured CBCT radiology reports follow a systematic protocol. This protocol examines every anatomical region within the field of view.

Specifically, a structured report evaluates the dentition, periodontium, periapical regions, and alveolar bone. It also assesses the maxillary sinuses, nasal cavity, airway, TMJs, cervical spine, and soft tissue calcifications. Each region receives dedicated assessment regardless of the referral question. As a result, specialist radiology reporting services detect more CBCT incidental findings than in-house review by non-specialist clinicians.

At 3Beam, every CBCT examination includes a structured radiology report from a UK Dental Radiologist. The report follows EADMFR-recommended methodology. It documents all findings across the entire field of view, with clinical commentary and recommended follow-up actions.

What Should Referring Clinicians Do When CBCT Incidental Findings Are Reported?

Receiving a radiology report that identifies CBCT incidental findings beyond your primary question requires a clear management pathway. The following approach reflects current best practice.

First, triage by urgency. Distinguish between findings that require immediate action, those needing scheduled follow-up, and those requiring monitoring only. For instance, suspected malignancy demands urgent referral. In contrast, small retention cysts typically need only periodic review.

Second, communicate with the patient. The referring clinician has a duty to inform the patient of clinically relevant incidental findings. Document this communication in the patient’s records. For findings outside your clinical scope, explain that you are arranging an onward referral.

Third, arrange specialist referral when needed. Vascular calcifications warrant GP referral. Sinus pathology may need ENT assessment. Suspicious osseous lesions require oral and maxillofacial surgery review. The radiology report should guide these decisions with specific recommendations.

Finally, document everything. Record all incidental findings in the patient’s notes along with the actions taken. This documentation provides medico-legal protection. It also ensures continuity of care if the patient transfers to another practitioner.

How 3Beam’s Reporting Protects Referrers and Patients

At 3Beam Imaging Centre, the structured reporting protocol specifically addresses CBCT incidental findings. Every scan receives a comprehensive written report covering all anatomical structures within the captured volume. The report documents both positive findings and pertinent negatives. As a result, the referring clinician has a complete clinical picture.

Where an incidental finding requires further investigation, the report includes a specific recommendation. This might involve follow-up imaging, specialist referral, or clinical correlation. Importantly, this approach transfers the identification burden to a specialist radiologist. It also provides the referrer with a clear, defensible record.

For clinicians who do not have specialist radiology training, this service is not merely convenient. It is a critical safeguard against missing significant pathology in the CBCT volume.

Frequently Asked Questions

Q: What percentage of CBCT scans contain incidental findings?
A: Published research reports that 69 to 80% of dental CBCT scans contain at least one incidental finding. On average, there are approximately 2.6 findings per scan. These range from minor anatomical variants to findings that require active treatment.

Q: Am I legally required to report on the entire CBCT volume?
A: Yes. Under IR(ME)R 2017 and the EADMFR (SEDENTEXCT) guidelines, the practitioner must assess all structures within the field of view. Furthermore, the FGDP recommends a formal written report for every CBCT examination.

Q: What are the most common types of CBCT incidental findings?
A: Dental pathology accounts for approximately 55% of incidental findings. Paranasal sinus and airway abnormalities represent 29%. Osseous pathology makes up 15%. Additionally, vascular calcifications appear in around 9% of scans.

Q: What should I do if the report identifies a carotid artery calcification?
A: Refer the patient to their GP for cardiovascular risk assessment. Carotid calcifications on CBCT do not confirm significant stenosis. However, they serve as a marker that warrants further investigation. Document the finding and referral in the patient’s records.

Q: Can I rely on in-house review instead of specialist reporting?
A: In-house review is acceptable if the reviewing clinician holds appropriate training and follows a structured protocol. However, studies show that specialist reporting services detect significantly more incidental findings. This is particularly true for findings in the paranasal sinuses, airway, and cervical spine.

The Bottom Line on CBCT Incidental Findings

CBCT incidental findings are not rare exceptions. They are a near-certain feature of most dental CBCT examinations. With prevalence rates consistently above 69%, every scan carries a high probability of revealing pathology beyond the referral question. Consequently, failing to identify and act on these findings creates clinical risk and medico-legal exposure.

Structured radiology reporting provides the most reliable safeguard. It ensures that every anatomical region within the field of view receives systematic assessment. For any clinician who refers patients for CBCT imaging, understanding what incidental findings may appear is essential. Ensuring a robust reporting pathway is in place represents the standard of care.