Evaluation and Treatment of Left Scalp Hematoma
For a scalp hematoma following head trauma, obtain a non-contrast head CT if the patient meets validated clinical decision rule criteria (New Orleans Criteria or Canadian CT Head Rule), particularly if there is loss of consciousness, post-traumatic amnesia, age >60 years, coagulopathy, or dangerous mechanism of injury; otherwise, clinical observation with close monitoring for neurological deterioration is appropriate.
Initial Risk Stratification
The evaluation hinges on determining whether neuroimaging is indicated using validated clinical decision rules 1. The 2021 ACR Appropriateness Criteria provides the framework:
Indications for CT Head (Level A and B Recommendations)
For patients WITH loss of consciousness (LOC) or post-traumatic amnesia (PTA), obtain CT if ANY of the following are present 1:
- Headache
- Vomiting
- Age >60 years
- Drug or alcohol intoxication
- Short-term memory deficits
- Physical evidence of trauma above the clavicle
- Post-traumatic seizure
- GCS <15
- Focal neurological deficit
- Coagulopathy (including warfarin, but controversial for antiplatelet agents alone)
For patients WITHOUT LOC or PTA, consider CT if 1:
- Focal neurological deficit
- Vomiting
- Severe headache
- Age ≥65 years
- Physical signs of basilar skull fracture
- GCS <15
- Coagulopathy
- Dangerous mechanism (ejection from vehicle, pedestrian struck, fall >3 feet or 5 stairs)
Scalp Hematoma-Specific Considerations
The presence and characteristics of the scalp hematoma itself provide important prognostic information:
Location matters significantly - Temporal/parietal hematomas carry 6-fold increased odds of intracranial injury (ICI), and occipital hematomas carry 5.6-fold increased odds, compared to frontal locations 2.
Size is critical - Large and boggy hematomas confer 9.9-fold increased odds of ICI compared to small localized hematomas 2.
Age stratification - Infants 0-6 months with scalp hematomas have 13.5-fold increased odds of ICI, though the association remains significant across all pediatric age groups 2.
Important Caveat
The presence of a scalp hematoma increases ICI risk independent of skull fracture - ruling out a linear skull fracture does NOT eliminate the risk of intracranial pathology (OR 3.3 even without fracture) 2.
Management Algorithm
If CT is NOT indicated:
- Observation period: Monitor for neurological deterioration
- Discharge criteria: Ensure reliable caregiver can observe for warning signs
- Return precautions: Worsening headache, vomiting, confusion, focal deficits, seizures
If CT IS indicated:
- Obtain non-contrast head CT with multiplanar reformatted images 1
- Manage based on findings (hemorrhage, fracture, mass effect)
Treatment of the Hematoma Itself
Conservative management is the standard approach 3:
- Non-elastic bandage with direct compression
- Observation for expansion or signs of infection
- Surgery is reserved for: expanding hematomas causing functional compromise, neurovascular compression, or failed conservative management 3
Infection Risk (Rare but Serious)
Subgaleal hematomas can become infected, particularly with 4:
- Skin barrier disruption
- Hematogenous spread (especially in young children)
- Underlying skull fracture
Red flags for infection 4:
- Persistent fever
- Increasing swelling after initial improvement
- Irritability (in children)
- Warmth, erythema, fluctuance
If infection suspected: obtain MRI, needle aspiration for culture, IV antibiotics, and surgical debridement if abscess present 4.
Special Population: Late Presentation (>24 hours)
For patients presenting >24 hours after injury with scalp hematoma but NO red flags (neurological symptoms, focal signs, severe mechanism), a wait-and-see approach is reasonable rather than routine neuroimaging 5. All such patients in one study had good outcomes without intervention, though pathological CT findings were occasionally present 5.
Critical Pitfalls to Avoid
Do not assume skull radiographs are adequate - CT has replaced plain films for detecting neurosurgical lesions 1
Do not dismiss coagulopathy - Most guidelines recommend CT for ALL head trauma patients on anticoagulation, though antiplatelet therapy alone remains controversial 1
Do not rely solely on GCS 15 - Patients with GCS 15 can still have significant ICI requiring neurosurgery, particularly with other risk factors 1
Do not ignore hematoma location and size - These characteristics independently predict ICI risk beyond clinical decision rules 2