A 13‑month‑old infant presents to the emergency department after head trauma with swelling and tenderness over the right orbit and right nasal area, no loss of consciousness, and normal behavior. Does she require a facial computed tomography (CT) scan or a facial plain radiograph (X‑ray)?

No Facial CT or X-ray Needed for This Child

This 13-month-old does not require facial CT or X-ray imaging based on the clinical presentation. The child meets PECARN very low-risk criteria for head trauma and can be safely managed with observation alone 1.

Risk Stratification Using PECARN Criteria

For children <2 years of age, this patient falls into the very low-risk category because she has:

• GCS of 15 (implied by normal behavior)
• No loss of consciousness
• Normal behavior per presentation
• No altered mental status
• No palpable skull fracture mentioned

The PECARN criteria for children <2 years demonstrated 100% sensitivity and 100% negative predictive value for clinically important traumatic brain injury, with a risk of <0.02% in this very low-risk group 1.

Why Facial Imaging Is Not Indicated

The Question Is About Facial Bones, Not Brain Injury

While the PECARN guidelines address head CT for intracranial injury, the principles apply here:

• Plain radiographs are insufficient for evaluating facial trauma in children, as they miss up to 50% of intracranial injuries and provide limited soft tissue detail 1
• Facial CT would only be appropriate if there were clinical concern for significant facial fractures requiring surgical intervention (e.g., orbital entrapment, severe displacement, functional impairment) 2

Clinical Findings Don't Meet Threshold for Imaging

The described findings—swelling and tenderness to the right orbit and nose—are:

• Consistent with soft tissue injury from minor trauma
• Not indicative of fractures requiring intervention in the absence of:
  • Enophthalmos or globe displacement
  • Restricted extraocular movements
  • Significant facial asymmetry or deformity
  • Malocclusion
  • Palpable step-offs or bony crepitus
  • Periorbital ecchymosis suggesting deeper injury

Recommended Management Approach

Observation is the appropriate management strategy:

1. Clinical monitoring for 4-6 hours for:

   • Development of altered mental status
   • Persistent or worsening vomiting
   • Clinical deterioration
   • Worsening swelling or new neurologic signs

2. Parental education about red flag symptoms requiring return:

   • Altered behavior or consciousness
   • Persistent vomiting
   • Severe or worsening headache
   • Visual changes
   • Seizures

3. Reassess need for imaging only if:

   • Clinical deterioration occurs during observation 1
   • New concerning findings develop (e.g., restricted eye movements, significant proptosis)
   • Multiple risk factors emerge 3

Important Caveats

When Facial CT Would Be Indicated

Facial CT becomes appropriate when there is 2:

• Clinical suspicion for orbital entrapment (restricted eye movements, pain with eye movement)
• Significant facial deformity requiring surgical planning
• Functional impairment (vision changes, severe malocclusion)
• High-energy mechanism with concern for complex midface fractures

Age-Specific Considerations

Children <3 months have higher rates of traumatic brain injury (14% vs 4.1% in older infants) and clinically important TBI (8.1% vs 1.5%) 4. However, this 13-month-old falls outside this highest-risk age group.

Radiation Risk

Avoiding unnecessary CT in young children is critical due to radiation-induced cancer risk, particularly in infants whose developing tissues are most vulnerable 4, 5. The risk-benefit calculation strongly favors observation when clinical criteria don't suggest significant injury.

Bottom Line

Discharge with observation instructions is appropriate. The localized soft tissue swelling and tenderness without functional impairment, altered mental status, or high-risk mechanism does not warrant the radiation exposure and cost of facial imaging in this very low-risk patient 1, 3.