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Interpret this CT scan of a 2.5 week RTA Patient

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traumatic brain injury CT findings decompressive craniectomy

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Disclaimer: This is an AI-assisted educational interpretation only. All CT findings must be reviewed and confirmed by a qualified radiologist and neurosurgeon before any clinical decisions are made.

CT Brain Interpretation - Post-RTA Patient

Patient: Tulsi Pandey, 51 years old, Male Institution: North Bengal Neuro Centre Pvt. Ltd. Clinical context: 2.5 weeks post Road Traffic Accident (RTA)

Key Findings

1. Post-Decompressive Craniectomy Changes (MOST PROMINENT FINDING)

The bottom row of images is the most striking. There is a large right-sided decompressive craniectomy defect - the skull is markedly absent over a wide area of the right cerebral hemisphere. This is a surgical intervention that was performed to relieve intractable raised intracranial pressure (ICP), consistent with a severe TBI timeline of ~2.5 weeks.
On the accompanying 3D reconstruction (bottom right), the craniectomy defect is clearly visible as a large bony defect over the right hemisphere.

2. Cerebral Herniation Through the Craniectomy Site ("Cerebral Mushrooming")

The axial slices at the level of the craniectomy show brain tissue herniating outward through the bone defect - a known post-operative phenomenon called syndrome of the trephined or external cerebral herniation. The brain parenchyma appears to be bulging beyond the confines of the calvarium on the right side.

3. Cortical/Parenchymal Changes - Right Hemisphere

  • There are areas of heterogeneous density within the right cerebral hemisphere, suggesting a mix of:
    • Residual/evolving intracerebral hemorrhage (areas of hyperdensity)
    • Cerebral contusion with surrounding edema
    • Possible areas of encephalomalacia (tissue loss) where prior hemorrhage/infarct has evolved
At 2.5 weeks, acute blood (which is hyperdense on CT) begins transitioning to an isodense or hypodense phase - this "subacute" appearance is consistent with the timing.

4. Subdural Collection

There is likely a right-sided subdural collection - at 2.5 weeks post-injury, an acute subdural hematoma would be transitioning from hyperdense to isodense/mixed density. The crescentic shape along the right convexity and temporal region is suggestive.

5. Midline Shift

There appears to be leftward midline shift of the falx and septum pellucidum. The decompressive craniectomy will have partially relieved this, but residual shift may still be present due to underlying cerebral edema and contusion. A midline shift >5 mm on CT is an indicator of surgical urgency per Goldman-Cecil guidelines.

6. Ventricular System

  • The lateral ventricles appear compressed or asymmetric, more so on the right - consistent with right-sided mass effect.
  • No obvious signs of obstructive hydrocephalus in the current images, but this must be assessed carefully at follow-up.

7. Posterior Fossa / Brainstem

The posterior fossa slices (top rows) show the cerebellum and brainstem to be relatively preserved, with no obvious hemorrhage in those regions, though the images are limited in resolution at this viewing quality.

8. Scalp/Soft Tissue

There is evidence of soft tissue swelling and post-operative changes over the right scalp corresponding to the craniectomy site.

Summary Interpretation

FindingSignificance
Right decompressive craniectomyPrior surgical intervention for raised ICP
External cerebral herniation at defectPost-craniectomy phenomenon; brain swelling persists
Right hemispheric contusion/hemorrhageEvolving (2.5 weeks) - now subacute/chronic phase
Probable right subdural collectionTransitioning to isodense/hypodense on CT at this stage
Midline shift (leftward)Residual mass effect from right-sided pathology
Compressed right lateral ventricleMass effect from edema/hemorrhage

Clinical Implications at 2.5 Weeks Post-RTA

  1. Cranioplasty planning: The patient will need cranioplasty (replacement of the bone flap or synthetic implant) once cerebral swelling has sufficiently resolved - typically 3 to 6 months post-injury. Premature cranioplasty risks re-herniation.
  2. Syndrome of the trephined: Patients with large craniectomy defects can paradoxically deteriorate neurologically due to atmospheric pressure on the exposed brain. Some may show improvement after cranioplasty.
  3. Rehabilitation and neurological monitoring: The extent of right hemispheric involvement raises concern for left-sided motor/sensory deficits, aphasia (if dominant hemisphere involved), and cognitive impairment.
  4. Repeat CT: Given the evolving nature of subacute hemorrhage and ongoing edema, serial imaging at 4 to 6 week intervals is warranted to track resolution and plan cranioplasty timing.
  5. ICP monitoring: If the patient remains symptomatic or deteriorating, ICP monitoring and close neurosurgical follow-up are essential. A 2024 review in Frontiers in Neurology highlights the role of ICP-guided surgical decision-making in severe TBI.
In summary: This is a post-decompressive craniectomy brain CT in a patient with severe traumatic brain injury from RTA. The scan shows a large right-sided craniectomy defect with external cerebral herniation, evolving right hemispheric contusion/hematoma in the subacute phase, and residual midline shift. This requires close neurosurgical follow-up and eventual cranioplasty.
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