Neurologic Imaging

What Imaging Is Best for a Suspected Nasal Fracture After Facial Trauma?

·
What Imaging Is Best for a Suspected Nasal Fracture After Facial Trauma?

It’s 10 PM in the emergency department, and you’re evaluating a patient who took a fall and landed face-first. They have a visibly deviated nose, significant tenderness over the nasal bridge, and persistent epistaxis. After completing the primary survey and ensuring the patient is stable, your focus turns to characterizing the injury. Is this a simple, isolated nasal fracture, or is there a more complex injury involving the deeper facial structures? Choosing the right initial imaging study is critical for accurate diagnosis and guiding consultation with ENT or plastic surgery. For this specific presentation, the American College of Radiology (ACR) rates CT maxillofacial without IV contrast as Usually Appropriate, providing the detailed bony anatomy needed to make the right call.

Who Fits This Clinical Scenario?

This guidance applies to hemodynamically stable patients who have undergone a primary trauma survey and present with findings isolated to the central midface, strongly suggesting a nasal injury. The key inclusion criteria are one or more of the following signs after trauma:

  • Visible nasal deformity
  • Palpable nasal deformity or step-off
  • Point tenderness on palpation of the nasal bones
  • Epistaxis (nosebleed)

It is crucial to distinguish this focused scenario from more extensive facial trauma. This workflow is not intended for patients with signs suggesting injury to other facial regions, which require different imaging considerations. For example, if the patient also has tenderness over the forehead, you should consider the workup for a frontal bone injury. Similarly, if there is pain with jaw manipulation, malocclusion, or a palpable zygomatic arch deformity, the concern shifts to a potential Le Fort, zygomatic, or mandibular fracture, which represent distinct clinical scenarios with their own imaging pathways. This article is exclusively for cases where the clinical suspicion is centered on the nasal skeleton.

What Diagnoses Are You Working Up in This Scenario?

When ordering imaging for a suspected nasal injury, you are evaluating for a spectrum of potential diagnoses, ranging from simple to complex. The primary goal is to differentiate injuries that can be managed conservatively from those requiring urgent intervention.

The most common diagnosis is an isolated nasal bone fracture. These are frequent injuries and often do not require surgical intervention unless there is significant cosmetic deformity or airway obstruction. Imaging helps confirm the fracture and assess the degree of displacement, which informs the treatment plan.

A more consequential injury is a naso-orbito-ethmoid (NOE) complex fracture. This involves the confluence of the nasal, orbital, and ethmoid bones and is considered a severe midface injury. NOE fractures can lead to telecanthus (widening of the distance between the eyes) and require specialized surgical repair. CT is essential to identify the characteristic comminution and involvement of the medial canthal tendon attachment site.

While primarily a clinical diagnosis, imaging can sometimes reveal signs of a septal hematoma. This is a collection of blood between the septal cartilage and its overlying perichondrium. If missed, it can lead to avascular necrosis of the cartilage, resulting in a saddle-nose deformity. While direct visualization with anterior rhinoscopy is the diagnostic standard, a CT may show septal thickening that raises suspicion.

Finally, in cases of higher-energy trauma, the injury pattern may extend to include components of a Le Fort fracture, particularly types II or III which can involve the nasal root. While less likely in isolated-appearing nasal trauma, CT is highly effective at identifying these more extensive fracture patterns that would be missed on simpler imaging.

Why Is CT Maxillofacial without IV Contrast the Recommended Study for This Presentation?

The ACR designates CT maxillofacial without IV contrast as Usually Appropriate because it provides the optimal balance of diagnostic accuracy and safety for evaluating acute bony nasal trauma. This study offers superior spatial resolution of the complex, three-dimensional anatomy of the nasal bones, septum, and adjacent structures like the ethmoid sinuses and medial orbital walls. It is highly sensitive for detecting fracture lines, assessing displacement and comminution, and identifying extension into the NOE complex—details that are critical for surgical planning.

Alternative imaging modalities are rated lower for specific reasons in this context.

  • Radiography (paranasal sinuses) is rated May be appropriate. While it uses very low radiation, its diagnostic utility is limited. Plain films have poor sensitivity for non-displaced fractures and provide almost no information about the nasal septum or deeper structures. They can often miss complex injuries like NOE fractures entirely, potentially leading to a false sense of security.
  • Ultrasound (maxillofacial) is also rated May be appropriate. It is a valuable tool, particularly in pediatric patients, as it involves no ionizing radiation. It can be effective for identifying simple, displaced fractures of the nasal bones. However, it is highly operator-dependent and cannot visualize deeper structures like the posterior septum, cribriform plate, or ethmoid sinuses, limiting its role in ruling out more complex injuries.

Modalities like MRI and CT with intravenous contrast are deemed Usually not appropriate. IV contrast adds no value for assessing acute bony fractures and introduces the risks of an allergic reaction and contrast-induced nephropathy, along with increased radiation dose for a contrast-enhanced CT. MRI is excellent for soft tissue but poor for delineating fine bony detail and is too slow and costly for this indication.

The recommended study, non-contrast CT, carries a low to moderate radiation dose (ACR RRL: ☢☢ for adults, ☢☢☢ for pediatrics). This is a key consideration, but the high diagnostic yield in this scenario justifies its use over less sensitive methods.

What’s Next After CT Maxillofacial without IV Contrast? Downstream Workflow

The radiologist’s report and your clinical assessment will guide the next steps in patient management. The workflow branches based on the imaging findings.

  • If the study is positive for an isolated, non-displaced or minimally displaced nasal bone fracture: The patient can typically be managed non-operatively. This often involves analgesia, ice, and instructions to avoid contact sports. A follow-up appointment with an otolaryngology (ENT) or plastic surgery specialist in 1-2 weeks may be arranged to reassess for any cosmetic or functional concerns once the swelling has subsided.
  • If the study is positive for a significantly displaced nasal fracture or a complex naso-orbito-ethmoid (NOE) fracture: This requires an urgent consultation with the appropriate surgical service (ENT, Plastic Surgery, or Oral and Maxillofacial Surgery). These injuries often necessitate surgical reduction and fixation to restore appearance and function and prevent long-term complications like telecanthus.
  • If the study is negative for fracture but clinical suspicion remains high: Management should be guided by the clinical exam. A crucial step is to perform anterior rhinoscopy to rule out a septal hematoma, which is a clinical diagnosis and a true emergency requiring immediate incision and drainage. If no hematoma is present, the injury can be treated as a soft tissue contusion with symptomatic care and follow-up.
  • If the findings are indeterminate or suggest a different injury pattern: Re-evaluate the patient. If the CT reveals an unexpected finding, such as an orbital floor fracture or frontal sinus involvement, the workflow should pivot to address that specific injury, which may involve further imaging or different specialty consultations.

Pitfalls to Avoid (and When to Get Help)

Navigating the workup for a suspected nasal injury requires careful attention to a few common pitfalls.

First, do not let a “negative” CT report for fracture distract from the clinical exam. The most urgent diagnosis, a septal hematoma, must be ruled out at the bedside via direct inspection. Missing this can lead to permanent cartilage damage.

Second, avoid defaulting to plain radiographs. While seemingly a lower-radiation option, their low sensitivity for complex fractures can provide false reassurance and delay the diagnosis of a more significant injury like an NOE fracture.

Third, always consider associated injuries with high-energy mechanisms. A forceful blow to the nose can transmit force to the skull base. Be vigilant for signs of a cerebrospinal fluid (CSF) leak (e.g., clear rhinorrhea, “halo” sign), which would necessitate a different imaging protocol and an urgent neurosurgical consultation.

Finally, remember pediatric considerations. Children have developing facial skeletons, and imaging protocols should be tailored to use the lowest possible radiation dose (As Low As Reasonably Achievable – ALARA principles). Ultrasound may be a more appropriate first-line tool in some pediatric cases. If CT is necessary, ensure the protocol is optimized for pediatric patients.

Related ACR Topics and Tools

This article focuses on a single clinical variant. For a comprehensive overview of all scenarios related to facial trauma imaging, or to explore the tools used to develop these guidelines, the following resources are essential:

Frequently Asked Questions

Does every patient with a broken nose or epistaxis need a CT scan?

Not necessarily. The decision to order a CT scan is clinical. For isolated tenderness without significant deformity or suspicion of a more complex injury, many clinicians manage based on physical exam alone. The ACR guidelines apply when the clinician has decided that imaging is warranted to rule out a complex fracture or to guide surgical planning.

What is a septal hematoma and why is it an emergency?

A septal hematoma is a collection of blood that strips the perichondrium from the underlying nasal septal cartilage. The cartilage receives its blood supply from this overlying tissue. If the hematoma is not drained promptly (within 24 hours), the cartilage can die, leading to a perforation or a collapse of the nasal bridge, known as a ‘saddle-nose deformity.’ It is a clinical diagnosis that requires immediate incision and drainage.

Why not just get a simple X-ray for a suspected nasal fracture?

While plain X-rays (radiography) can sometimes show a nasal fracture, they are rated as only ‘May be appropriate’ because they have low sensitivity for non-displaced fractures and provide very limited information about the nasal septum, ethmoid sinuses, or orbits. A CT scan is far superior for identifying the full extent of the injury, which is critical for determining the need for surgical intervention.

What is the difference between a CT Maxillofacial and a CT Head scan?

A CT Maxillofacial scan is specifically tailored to visualize the bones of the face. It uses thin slices and high-resolution bone algorithms to provide exquisite detail of structures like the nasal bones, orbits, zygoma, and maxilla. A CT Head scan is optimized to evaluate the brain and skull, typically using thicker slices, and provides less detail of the delicate facial skeleton. Ordering the correct study is crucial for diagnostic accuracy.

Is ultrasound a good imaging alternative for children with a suspected nasal fracture?

Ultrasound is rated ‘May be appropriate’ and can be a very good first-line option in children, as it avoids ionizing radiation. It is effective at identifying simple, displaced fractures of the nasal bones. However, its main limitation is that it cannot visualize deeper structures. If there is concern for a more complex injury (e.g., NOE fracture) based on the mechanism or physical exam, a low-dose CT scan may still be necessary.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 29, 2026