CT Brain Plain - Clinical Analysis

CT Findings - Summary & Significance

1. Acute Sub-Dural Hemorrhage (aSDH)

• Bilateral fronto-parieto-temporal convexity, crossing the midline and anterior falx
• Maximum thickness 8.4 mm along right frontal convexity
• Significance: This is an acute SDH - likely traumatic in etiology. In a known GTCS patient, this raises two possibilities: (a) head trauma during a seizure fall caused the SDH, or (b) the SDH itself provoked a seizure. Either way, this is a neurosurgical emergency requiring urgent evaluation.
• The 8.4 mm thickness is borderline for surgical intervention (threshold typically >10 mm or midline shift >5 mm), but must be monitored closely.

2. Mild Sub-Arachnoid Hemorrhage (SAH)

• Along bilateral frontal sulcal spaces
• Significance: Traumatic SAH - indicates cortical/bridging vessel disruption. Associated with worse outcomes in TBI. Increases the risk of post-traumatic seizures.

3. Generalized Cerebral Edema (S/o)

• Sulcal spaces, fissures, basal cisterns, and cerebellar folia appear effaced
• Significance: This is a critical finding. Effacement of cisterns (particularly basal cisterns) is a sign of raised intracranial pressure (ICP). In a GTCS patient, this:
  • Worsens the seizure threshold
  • May cause transtentorial herniation if ICP is not controlled
  • Requires urgent ICP management

4. No Significant Midline Shift

• Reassuring - suggests current brain displacement is not critical
• Ventricular system normal - no obstructive hydrocephalus

5. Linear Minimally Displaced Frontal Bone Fracture

• Right paramedian location
• Fracture line extending posteriorly and superiorly across sagittal suture to involve left parietal bone
• Further extends anteriorly involving both outer and inner tables of left frontal sinus
• Resultant frontal and ethmoid hemosinus
• Significance:
  • Involvement of the inner table of frontal sinus creates a communication with the intracranial compartment - risk of pneumocephalus, CSF leak (rhinorrhea), and intracranial infection (meningitis)
  • This is effectively a compound/open fracture of the anterior skull base
  • Prophylactic antibiotics are debated but neurosurgical input is essential
  • The fracture pattern (crossing sagittal suture) suggests significant traumatic force

6. Subgaleal Hematoma

• High fronto-parietal and bilateral frontal region
• Significance: Consistent with the trauma mechanism; soft tissue marker of injury severity

7. NGT Noted - patient is likely intubated/GCS compromised

Clinical Correlation in a K/C/O GTCS Patient

GTCS episode → Fall/trauma → aSDH + SAH + Cerebral Edema → Raised ICP → Worsens seizure threshold → More seizures

Key Concerns:

Immediate Management Priorities

A. Airway/Breathing/Circulation

• NGT in situ - patient likely intubated or GCS-compromised
• Maintain SpO2 >95%, avoid hypoxia (worsens secondary brain injury)
• Maintain SBP >90 mmHg (avoid hypotension)
• Target CPP 60-70 mmHg in adults

B. ICP Management (for generalized cerebral edema)

• Head of bed elevation to 30°
• Hyperosmolar therapy:
  • Mannitol 0.5-1 g/kg IV (20% solution) OR
  • 3% Hypertonic saline 2-5 mL/kg IV over 15 min (preferred if hypotensive, avoids renal failure risk)
• Target PaCO2 35-40 mmHg on ventilator (avoid prophylactic hyperventilation <30 mmHg)
• Steroids are CONTRAINDICATED in TBI - associated with increased mortality (CRASH trial data; RR 1.18)
• Normothermia (35-38°C)

C. Seizure Management

• This patient has a known GTCS history AND a new structural lesion (SDH + SAH) - double high-risk for seizures
• Seizure prophylaxis for 7 days post-injury is indicated:
  • Levetiracetam (preferred - fewer drug interactions, no need for levels) OR
  • Phenytoin/Fosphenytoin IV
• Prophylaxis beyond 7 days is NOT routinely recommended (does not prevent late seizures)
• If active seizures: IV benzodiazepines (lorazepam/diazepam) as first line, followed by levetiracetam/phenytoin load
• Continue the patient's existing anti-epileptic drug regimen; check compliance and serum levels

D. Neurosurgical Consultation (URGENT)

• Indications present:
  • Acute SDH with cerebral edema
  • Frontal bone fracture with frontal sinus inner table involvement (potential CSF leak)
  • Risk of intracranial infection from compound frontal fracture
• Current aSDH (8.4 mm, no significant MLS) may be managed conservatively with close monitoring
• Repeat CT at 6-12 hours or sooner if neurological deterioration
• Serial GCS monitoring every 1-2 hours

E. Frontal/Ethmoid Sinus Fracture - Specific Management

• Check for CSF rhinorrhea (beta-2 transferrin test if rhinorrhea present)
• Ophthalmic review if ethmoid involvement affects orbit
• ENT/Neurosurgical input for frontal sinus fracture with inner table involvement
• Antibiotic prophylaxis: debated in guidelines, but most centers use it for compound anterior skull base fractures
• Tetanus prophylaxis

F. Laboratory Investigations

• CBC, coagulation profile (PT/INR, aPTT) - correct any coagulopathy
• Blood glucose (hypoglycemia worsens seizures and brain injury)
• Serum electrolytes, renal function (for mannitol use and osmolality monitoring)
• Serum anti-epileptic drug levels (check existing AED compliance)
• Type and cross-match

Monitoring

• ICU admission mandatory
• ICP monitoring (ventriculostomy/bolt) - consider if GCS deteriorates or edema worsens on repeat CT
• Continuous EEG monitoring (to detect subclinical seizure activity, especially important in a known GTCS patient)
• Repeat CT Brain at 12-24 hours

Key Teaching Points

• In a GTCS patient, always consider post-ictal head trauma as a cause of intracranial pathology
• The combination of aSDH + SAH + cerebral edema after trauma carries significant mortality risk
• Frontal sinus inner table fracture effectively creates an open skull base fracture - treat aggressively
• Steroids are harmful in TBI (contrary to older practice)
• Seizure prophylaxis is for early post-traumatic seizures only (7 days) - does not alter long-term epilepsy risk