Penetrating Neck Injuries
/Penetrating neck injuries account for 5-10% of all trauma presentations and carry a mortality rate of up to 10%. The neck contains a high concentration of vital vascular, aerodigestive, and neurologic structures within a small anatomic space, making these injuries particularly challenging. This post reviews the traditional zone-based approach, the evolving "no-zone" paradigm, hard and soft signs of injury, and evidence-based indications for imaging and surgical consultation.
Anatomy: the traditional zones
The neck is divided into three anatomic zones based on surgical accessibility. Zone II (cricoid to angle of mandible) is the most surgically accessible, while Zones I and III present greater operative challenges—Zone I may require sternotomy or thoracotomy for proximal control, and Zone III may require mandibular subluxation or craniotomy for distal exposure.
| Zone | Boundaries | Key Structures |
|---|---|---|
| Zone I | Clavicles/sternal notch to cricoid cartilage | Subclavian vessels, proximal carotid, vertebral arteries, trachea, esophagus, thoracic duct, lung apices |
| Zone II | Cricoid cartilage to angle of mandible | Carotid arteries, jugular veins, trachea, esophagus, larynx |
| Zone III | Angle of mandible to skull base | Distal carotid, vertebral arteries, pharynx, cranial nerves |
CLINICAL CASE 1: ZONE I INJURY
A 28-year-old male presents after a stab wound to the left supraclavicular fossa. He is hemodynamically stable with BP 118/72. On exam, you note a non-expanding hematoma at the wound site and diminished left radial pulse compared to the right. He denies dyspnea or dysphagia. No active bleeding is present.
Question to consider: What signs does this patient have—hard or soft? What imaging would you order?
HARD SIGNS VS. SOFT SIGNS
| HARD SIGNS (Typically mandate immediate intervention) | SOFT SIGNS (Warrant further evaluation) |
|---|---|
| Airway compromise | Non-pulsatile, non-expanding hematoma |
| Pulsatile or expanding hematoma | Venous oozing |
| Bruit or thrill | Dysphagia or odynophagia |
| Hemodynamic instability | Dysphonia/hoarseness |
| Active hemorrhage | Subcutaneous emphysema |
| Air bubbling through wound | Minor hemoptysis |
| Absent unilateral upper extremity pulse | Diminished (but present) peripheral pulses |
| Massive hemoptysis or hematemesis | |
| Symptoms of cerebral ischemia (stroke, altered mental status) |
Hard signs are associated with an 89.7% incidence of clinically significant injury—but this also means approximately 10% of patients with hard signs have no significant injury. Additionally, 19-24% of patients with hard signs may not require operative intervention. Stable patients with hard signs may benefit from CTA before exploration—one study showed CTA prevented 17 unnecessary neck explorations in patients with hard signs. [1]
CASE 1 ANALYSIS
Back to our patient: He has soft signs—a non-expanding hematoma and diminished (but not absent) radial pulse. He is hemodynamically stable without active hemorrhage.
Management: This patient warrants CTA of neck AND chest given the Zone I location. The pulse differential raises concern for subclavian or proximal carotid injury. Zone I injuries require chest imaging because structures extend into the thoracic outlet.
Caveat: If CTA reveals vascular injury, surgical or interventional radiology consultation is warranted. Zone I vascular injuries often benefit from endovascular approaches given difficult surgical access.
CLINICAL CASE 2: ZONE II INJURY
A 34-year-old female arrives via EMS after a gunshot wound to the anterior neck at the level of the thyroid cartilage. She is tachycardic (HR 112) but normotensive. She has an actively bleeding wound with blood in her oropharynx, hoarseness, and subcutaneous emphysema. She is protecting her airway but has audible stridor.
Question to consider: Hard or soft signs? What's your first priority?
THE "NO-ZONE" APPROACH
What is it?
The "no-zone" approach represents a paradigm shift from zone-based mandatory exploration to clinical presentation-guided management using physical examination findings and CT angiography (CTA) regardless of wound location.
Why the shift?
Traditional mandatory Zone II exploration had a 45-69% negative exploration rate [2,3]
CTA has high sensitivity (83-100%) and specificity (61-100%) for detecting injuries [2]
Physical examination is >95% sensitive for detecting arterial vascular injury
The "no-zone" approach reduces unnecessary neck explorations while maintaining safety [4,5]
Key Evidence:
A systematic review found the "no-zone" approach with CTA is well-supported by current evidence for safe management with reduced negative exploration rates [4]
In one study using the "no-zone" approach: 52% successful non-operative management, 7% negative exploration rate, and no missed injuries [5]
Important caveat: The "no-zone" approach applies to hemodynamically stable patients. Unstable patients or those with hard signs requiring immediate intervention should not have definitive management delayed for imaging
CASE 2 ANALYSIS
This patient has multiple hard signs: active bleeding, hemoptysis (blood in oropharynx), stridor (airway compromise), hoarseness, and subcutaneous emphysema.
Management:
First priority: Airway. This patient has stridor—prepare for difficult airway management. Have backup plans ready (bougie, surgical airway equipment at bedside, etc). If oral intubation fails or is contraindicated, proceed to surgical airway.
Second: Control hemorrhage with direct pressure.
Disposition: Given hard signs and Zone II location (most surgically accessible), this patient likely needs operative exploration. However, if she stabilizes with airway secured and hemorrhage controlled, CTA could guide operative planning and identify specific injuries. The decision to image vs. proceed directly to OR depends on clinical stability and institutional resources.
CLINICAL CASE 3: ZONE III INJURY
A 22-year-old male presents after an altercation with a stab wound just below the left angle of the mandible. He is hemodynamically stable. Exam reveals a small non-pulsatile hematoma, mild dysphagia, and left-sided tongue deviation. No active hemorrhage is noted.
Question to consider: What does the tongue deviation tell you? What additional imaging considerations exist for Zone III?
INDICATIONS FOR IMAGING
When to get CTA:
Hemodynamically stable patients with soft signs of injury
Stable patients with hard signs who do not require immediate surgical exploration
All Zone I injuries in stable patients (include chest CTA)
Zone III injuries with suspicion for injury (include head CTA)
Transcervical gunshot wounds (higher injury potential, often involve multiple zones)
CTA Performance [2]
Sensitivity: 83-100%
Specificity: 61-100%
Negative predictive value: 90-100%
High sensitivity/specificity for vascular injuries
Lower specificity for aerodigestive injuries—this is a key limitation
When CTA is not enough
If aerodigestive injury concern persists despite negative/equivocal CTA → esophagoscopy, esophagography, and/or bronchoscopy
If vascular injury concern persists → catheter angiography (also allows for endovascular intervention)
Clinical suspicion should guide additional workup even with negative CTA
CASE 3 ANALYSIS
This patient has soft signs: non-pulsatile hematoma, dysphagia, and a cranial nerve finding (tongue deviation = hypoglossal nerve, CN XII).
Management: This stable patient warrants CTA of neck AND head given Zone III location. The tongue deviation suggests possible injury near the skull base where the hypoglossal nerve exits. Zone III injuries may involve distal carotid or vertebral arteries near the skull base, and endovascular management is often preferred given difficult surgical access.
Pearl: Pharyngeal injuries in Zone III carry similar risks of descending infection and mediastinitis as esophageal injuries. Contrast swallow studies are less sensitive for hypopharyngeal injuries—consider flexible nasoendoscopy or direct laryngoscopy.
Caveat: Cranial nerve deficits may indicate proximity to major vascular structures but do not always indicate vascular injury. They warrant thorough imaging evaluation.
INDICATIONS FOR SURGICAL CONSULTATION/EXPLORATION
Immediate OR (no imaging):
Hemodynamic instability not responding to resuscitation
Hard signs with inability to stabilize
Airway compromise requiring surgical airway
Uncontrolled hemorrhage despite direct pressure
Operative intervention after workup:
CTA evidence of vascular injury requiring repair (especially Zone II—most accessible)
Documented aerodigestive injury
Symptomatic Zone II injuries with positive imaging
Endovascular options:
Zone I and III vascular injuries often benefit from endovascular management given surgical access challenges
Vertebral artery injuries—majority can be managed endovascularly or with observation
Approximately 20% of penetrating vertebral artery injuries require emergency surgery, while >33% require embolization
Important: Surgical consultation should occur early, even if operative intervention is not immediately indicated. Trauma surgery, vascular surgery, and/or ENT involvement depends on injury pattern and institutional resources.
MANAGEMENT ALGORITHM PEARLS
First step: Does the wound violate the platysma? If no → not a penetrating neck injury by definition. Manage as a superficial wound (appropriate wound care, tetanus prophylaxis as indicated, standard return precautions). Clinical judgment still applies regarding other injuries or need for observation.
Unstable or hard signs requiring immediate intervention? → Secure airway if needed → Immediate OR
Stable with hard signs? → Consider CTA to guide operative planning (may prevent unnecessary exploration)
Stable with soft signs? → CTA of neck (add chest for Zone I, head for Zone III)
Stable and asymptomatic with confirmed platysma violation? → Serial physical exams every 6-8 hours for 24-36 hours is a reasonable approach in select patients
Physical exam sensitivity: >95% for arterial injury, but lower for aerodigestive injuries—maintain high index of suspicion and low threshold for additional workup [2]
Esophageal injuries: Delayed diagnosis = increased morbidity. Have low threshold for esophagoscopy/esophagography if clinical concern persists
Transcervical GSW? → High injury potential (83% visceral injury rate). Low threshold for comprehensive imaging or bilateral exploration. [8]
AIRWAY CONSIDERATIONS
Secure unstable airway before anything else
Have backup airway equipment ready (surgical airway kit at bedside)
If oral-tracheal intubation fails or is contraindicated → surgical airway
Expanding hematoma can rapidly compromise airway—consider early intubation before complete obstruction
Awake intubation may be preferred in cooperative patients with concerning anatomy
Case 2 reminder: Stridor = impending airway loss. Don't wait for complete obstruction.
Case Summary Table
| Case | Zone | Signs Present | Key Findings | Management |
| Case 1 | Zone I | Soft signs | Non-expanding hematoma, diminished radial pulse | CTA neck + chest → consult based on findings |
| Case 2 | Zone II | Hard signs | Active bleeding, stridor, hemoptysis, subcutaneous emphysema | Secure airway → hemorrhage control → OR (consider CTA if stabilizes) |
| Case 3 | Zone III | Soft signs | Non-pulsatile hematoma, dysphagia, CN XII palsy | CTA neck + head → consult based on findings |
TAKE-HOME POINTS
The "no-zone" approach using clinical presentation + CTA is safe and reduces unnecessary surgery in stable patients
Hard signs = high likelihood of significant injury (~90%) but ~10% have no significant injury, and 19-24% may not require operative intervention
CTA is the imaging modality of choice for stable patients, but has limitations for aerodigestive injuries
Physical exam is highly sensitive for vascular injury but less reliable for aerodigestive injuries—maintain low threshold for additional workup
Zone I and III injuries are surgically challenging—consider endovascular options and involve appropriate specialists early
Don't delay esophageal injury diagnosis—increased morbidity with delayed repair
Transcervical GSW = high injury potential, low threshold for comprehensive workup
Post by: TARA TRONETTI, MD
Dr. Tronetti is a PGY-1 in Emergency Medicine at the University of Cincinnati
Editing by: ryan Lafollette, MD
Dr. Ryan LaFollette is an APD in Emergency Medicine at the University of Cincinnati and Co-editor of Tamingthesru.com
References
ACR Appropriateness Criteria Penetrating Neck Injury. Expert Panels on Neurologic and Vascular Imaging:, Schroeder JW, Ptak T, et al.'.
Western Trauma Association Critical Decisions in Trauma: Penetrating Neck Trauma. Sperry JL, Moore EE, Coimbra R, et al. The Journal of Trauma and Acute Care Surgery. 2013;75(6):936-40. doi:10.1097/TA.0b013e31829e20e3.
'No Zone' Approach to the Management of Stable Penetrating Neck Injuries: A Systematic Review. Chandrananth ML, Zhang A, Voutier CR, et al. ANZ Journal of Surgery. 2021;91(6):1083-1090. doi:10.1111/ans.16600.
Evaluation of Multidetector Computed Tomography for Penetrating Neck Injury: A Prospective Multicenter Study. Inaba K, Branco BC, Menaker J, et al. The Journal of Trauma and Acute Care Surgery. 2012;72(3):576-83; discussion 583-4; quiz 803-4. doi:10.1097/TA.0b013e31824badf7.
Role of Computed Tomography Angiography in the Management of Zone II Penetrating Neck Trauma in Patients With Clinical Hard Signs. Schroll R, Fontenot T, Lipcsey M, et al. The Journal of Trauma and Acute Care Surgery. 2015;79(6):943-50; discussion 950. doi:10.1097/TA.0000000000000713.
Computed Tomography Angiography in the "No-Zone" Approach Era for Penetrating Neck Trauma: A Systematic Review. Ibraheem K, Wong S, Smith A, et al. The Journal of Trauma and Acute Care Surgery. 2020;89(6):1233-1238. doi:10.1097/TA.0000000000002919.
Selective Management of Penetrating Neck Injuries Using "No Zone" Approach. Prichayudh S, Choadrachata-anun J, Sriussadaporn S, et al. Injury. 2015;46(9):1720-5. doi:10.1016/j.injury.2015.06.019.
Penetrating Neck Wounds. Mandatory Versus Selective Exploration. Ayuyao AM, Kaledzi YL, Parsa MH, Freeman HP. Annals of Surgery. 1985;202(5):563-7. doi:10.1097/00000658-198511000-00005.
