In pediatric traumatic brain injury, which CT features portend a poorer outcome?

• A. Small intracranial hemorrhage, open basal cisterns, no midline shift.
• B. Large intracranial hemorrhage, compressed basal cisterns, midline shift, or diffuse edema.
• C. No edema and normal cisterns.
• D. Only skull fracture without brain injury.

Answer: (B)

The main concept is that prognosis on CT in pediatric TBI is driven by mass effect and brain swelling. When the scan shows a large intracranial hemorrhage, compressed or absent basal cisterns, a midline shift, or diffuse cerebral edema, these findings reflect significant pressure on brain tissue and potential herniation. Each of these signs signals substantial injury and higher risk of poor functional outcome.

A large hematoma means a substantial volume of blood taking up space inside the skull, which raises intracranial pressure quickly. Compressed basal cisterns indicate that the brainstem and CSF pathways are being squeezed, a dangerous situation that correlates with worse recovery. Midline shift shows the brain is being pushed off its normal position, another marker of dangerous mass effect. Diffuse edema reveals widespread swelling of brain tissue, increasing intracranial pressure and the likelihood of secondary injury.

In contrast, a small intracranial hemorrhage with open cisterns, no midline shift, and no edema suggests limited mass effect and lower risk of dangerous ICP elevation, which is associated with a better prognosis. Normal cisterns with no edema and skull fracture alone without brain injury typically do not portend a poor outcome.

So, the CT pattern indicating the poorest outcome is large hemorrhage with signs of mass effect or diffuse swelling—compressed or absent cisterns, midline shift, and edema.