Neurologic Imaging

Should You Order Radiography for a Penetrating Neck Injury with Soft Signs?

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Should You Order Radiography for a Penetrating Neck Injury with Soft Signs?

It’s 2 a.m. in the emergency department, and you’re evaluating a stable 24-year-old patient with a superficial laceration to the lateral neck from a broken bottle during an altercation. There is no active bleeding, expanding hematoma, or airway compromise. However, you note minor subcutaneous emphysema on palpation and the patient reports some mild pain with swallowing. These are “soft signs” of a potentially deeper injury. You need to decide on the initial imaging workup to rule out significant underlying trauma without over-radiating a stable patient. This article details the clinical workflow for this specific scenario: a penetrating neck injury with only soft clinical signs of injury. For this presentation, the American College of Radiology (ACR) Appropriateness Criteria rate Radiography neck as Usually Appropriate.

Who Fits the Scenario of a Penetrating Neck Injury with Soft Signs?

This guidance applies to hemodynamically stable patients who have sustained a penetrating injury to the neck—such as a stab wound, gunshot wound, or injury from glass shards—and present exclusively with “soft signs” of injury. The injury must have violated the platysma muscle, but the patient shows no signs of immediate life-threatening injury.

Inclusion criteria for this scenario are the presence of one or more of the following soft signs:

  • Minor hemoptysis or hematemesis
  • Subcutaneous or mediastinal air (crepitus)
  • Dysphonia or hoarseness
  • Dysphagia or odynophagia
  • Non-expanding hematoma
  • Focal neurologic deficit (e.g., cranial nerve palsy) not explained by a direct nerve injury

This workflow is not appropriate for patients with “hard signs” of vascular or aerodigestive injury. These include active hemorrhage, shock unresponsive to fluids, expanding hematoma, airway compromise (e.g., stridor), bruit or thrill over a vessel, or massive subcutaneous emphysema. Such patients often require immediate surgical exploration or proceed directly to Computed Tomography Angiography (CTA) as a first-line study. This guidance also differs from the workup for patients whose initial CTA is normal but clinical concern for a specific injury type remains.

What Diagnoses Are You Working Up with Soft Injury Signs?

In a stable patient with soft signs, imaging aims to screen for occult injuries that require further investigation or intervention. The differential diagnosis guides the choice of the initial study.

Retained Radiopaque Foreign Body
A primary and immediate concern is the presence of a retained foreign object, such as a bullet fragment, knife tip, or piece of glass. Plain radiography is highly effective at identifying these objects, which can dictate the need for surgical removal and guide the approach. Missing a retained foreign body can lead to delayed infection, migration, or chronic pain.

Aerodigestive Tract Injury
The presence of subcutaneous emphysema is a direct sign of air escaping from the trachea, bronchus, or esophagus. A neck radiograph is a rapid, effective screening tool to confirm the presence and extent of free air (subcutaneous emphysema or pneumomediastinum), which strongly suggests an aerodigestive injury and mandates further, more specific evaluation.

Occult Vascular Injury
While not the definitive study for vascular assessment, a neck radiograph can reveal important secondary signs. A widened prevertebral soft tissue space or tracheal deviation can indicate a significant underlying hematoma, raising suspicion for a vascular injury that is not yet clinically obvious. These findings would prompt escalation to a more advanced vascular imaging study like CTA.

Cervical Spine or Bony Injury
Depending on the mechanism and trajectory, a penetrating injury can also cause fractures of the cervical vertebrae, hyoid bone, or laryngeal cartilage. A standard neck radiograph provides a good initial assessment of the bony structures, identifying fractures that could cause instability or be associated with other injuries.

Why Is Neck Radiography a Recommended First Step for Soft Signs?

For a stable patient with only soft signs of penetrating neck injury, the ACR rates both Radiography neck and CTA neck with IV contrast as Usually Appropriate. The choice to start with radiography is often a strategic one, balancing diagnostic yield with resource utilization and radiation exposure.

A neck radiograph serves as an excellent initial screening tool. It is fast, widely available, and delivers a low radiation dose (ACR Relative Radiation Level ☢☢, 0.1-1 mSv). It is highly sensitive for detecting two critical findings that can immediately change management: a radiopaque foreign body and free air from an aerodigestive injury. If either of these is present, the diagnosis is advanced, and the next steps become clearer. If the radiograph is entirely negative, it provides a degree of reassurance and helps triage patients who may not need more advanced, higher-dose imaging.

In contrast, while CTA is also Usually Appropriate and provides a comprehensive evaluation of vascular, aerodigestive, and bony structures, it involves a higher radiation dose (ACR RRL ☢☢☢, 1-10 mSv) and requires intravenous contrast, with its associated risks of allergy and nephropathy. Starting with a radiograph allows for a more selective use of CTA in patients whose initial screen is positive or in whom clinical suspicion remains high despite a negative radiograph.

Other modalities are rated lower for this initial screening scenario. Ultrasound (US) neck is rated May be appropriate; while excellent for evaluating superficial soft tissues and major vessels like the carotid and jugular, it is operator-dependent and limited by subcutaneous air and patient body habitus. Fluoroscopy biphasic esophagram is also May be appropriate but is a specialized test used to evaluate a specific concern (esophageal injury), not as a broad initial screen.

What’s Next After Neck Radiography? Downstream Workflow

The results of the initial neck radiograph will guide the subsequent diagnostic and management pathway. This is not a “one and done” study but rather the first step in a structured evaluation.

If the Radiograph is Positive:

  • Foreign Body or Free Air: If a radiopaque foreign body or subcutaneous/mediastinal air is identified, the patient requires further evaluation. The next logical step is typically a CTA neck with IV contrast to precisely locate the foreign body relative to vital structures and to comprehensively assess for associated vascular and aerodigestive injuries.
  • Suspicious Soft Tissue Swelling: If the radiograph shows tracheal deviation or a widened prevertebral space, this raises concern for a hematoma from an occult vascular injury. This finding should also prompt an immediate CTA neck with IV contrast.

If the Radiograph is Negative:

A negative radiograph in a patient with persistent soft signs (e.g., continued dysphagia or hoarseness) does not fully exclude an injury. At this point, the workup becomes more focused. If clinical suspicion for a vascular injury remains high based on the wound’s trajectory, a CTA is still warranted. If the primary concern is an aerodigestive injury (e.g., persistent dysphagia), the workup may proceed to more specific tests like a fluoroscopic esophagram or direct endoscopy. This aligns with the ACR sibling scenario, Penetrating neck injury. Normal or equivocal CTA. Concern for aerodigestive injury.

If the Radiograph is Indeterminate:

In cases where findings are unclear, the decision to proceed to CTA is based on the specific soft signs and the overall clinical picture. An indeterminate finding should lower the threshold for obtaining a more definitive cross-sectional imaging study.

Pitfalls to Avoid (and When to Get Help)

Navigating this scenario requires careful clinical judgment. Here are a few common pitfalls to avoid:

  • False Reassurance from a Negative Radiograph: Do not stop the workup if significant clinical signs persist despite a normal radiograph. It has low sensitivity for non-radiopaque foreign bodies, small esophageal tears, and subtle vascular injuries.
  • Ignoring the Platysma: A key determinant for imaging is whether the platysma muscle has been violated. Superficial wounds that do not cross this layer are much less likely to involve deep structures.
  • Delaying Advanced Imaging: If a patient’s status changes or new signs develop (e.g., an expanding hematoma), do not wait. Escalate immediately to CTA and obtain a surgical consultation.

If there is any uncertainty about the trajectory of the wound or if the patient’s signs are evolving, early consultation with a trauma surgeon or otolaryngologist is critical.

Related ACR Topics and Tools

The ACR Appropriateness Criteria are a powerful resource for evidence-based imaging decisions. For a comprehensive overview of all clinical variants related to this topic, see our parent guide. For tools to help with ordering, protocoling, and patient communication, see the resources below.

Frequently Asked Questions

Why is CTA neck also rated ‘Usually Appropriate’ for this scenario?

CTA neck with IV contrast is also rated ‘Usually Appropriate’ because it provides a comprehensive, one-stop evaluation of vascular, aerodigestive, bony, and soft tissue structures. However, it involves more radiation and IV contrast than a plain radiograph. The choice between starting with radiography or CTA often depends on institutional protocols, scanner availability, and the specific clinical suspicion. Radiography is often preferred as a lower-dose initial screening step.

What if the penetrating object was a wooden splinter or plastic shard?

Radiographs are generally poor at visualizing non-radiopaque foreign bodies like wood or plastic. If there is high suspicion for such an object, ultrasound may be helpful for superficial locations. For deeper suspicion, a non-contrast CT can sometimes identify these objects or the associated inflammatory tract. If clinical suspicion is high, surgical exploration may be necessary regardless of imaging findings.

Does the ‘zone’ of the neck injury affect the choice to start with a radiograph?

While the neck zones (I, II, and III) are critical for surgical planning, the initial imaging choice for a stable patient with only soft signs is less dependent on the zone. A radiograph is a useful screen regardless of the zone to look for foreign bodies or free air. However, an injury in Zone I (thoracic inlet) or Zone III (base of skull) may increase suspicion for major vascular injury and lower the threshold to proceed directly to CTA.

If a patient has hoarseness, should I order a radiograph first?

Yes, hoarseness is a soft sign of injury, potentially related to laryngeal trauma or recurrent laryngeal nerve injury. A radiograph is an appropriate first step to screen for associated findings like laryngeal cartilage fractures (which can sometimes be seen), free air, or a hematoma causing mass effect. If the radiograph is negative but hoarseness persists, further evaluation with CT and/or direct laryngoscopy is indicated.

Is there a role for MRA in this acute setting?

Magnetic Resonance Angiography (MRA) is rated ‘May be appropriate’ but is rarely used as a first-line imaging modality in the acute setting of penetrating neck trauma. It is time-consuming, less available than CT, and more susceptible to motion artifact in an uncooperative patient. Its primary role is as a problem-solving tool for suspected vascular injuries in stable patients when CT is contraindicated (e.g., severe contrast allergy) or inconclusive.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 26, 2026