Case Studies: MRI
Brain - Middle Cerebral Artery Aneurysm
Introduction
- MRI's superiority in imaging the brain is due to its high soft tissue contrast resolution while its multi-planer capability enables anatomy to be viewed from different directions.
Patient History
- A 48 year old male presented with sudden severe headaches for 7- 10 days with sensations in legs
- Gradual slow recovery
- He saw a neurologist who referred him for MRI brain and MRA Circle of Willis
Methodology
- MRI Brain Dual echo axial (fig 1)
- T2 axial FLAIR, T2 COR TSE, T1 sag SE (fig 2) 5mm slice thickness/3D vol 1mm slices
- MRA 3D TOF (Time of Flight) COW (Circle of Willis) (fig 3)
- MIP's (Maximum Intensity Projections) were obtained from the 3D raw data (fig 4)
- Scanner used: Siemens 1.5T Magnetom Symphony, using a CP Head Array Coil
Conclusion
- A 1 cm x 7 mm aneurysm at the junction of the M1 and M2 segments of the right middle cerebral artery
- High signal is seen in the right sylvian fissure, consistent with presence of methaemoglobin, due to recent subarachnoid haemorrhage (1 to 2 weeks ago)
- No other intracranial abnormality is seen.
Fig 1
Fig 2
Fig 3
Fig 4
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