MRI Brain non contrast (Encephalopathy protocol)
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No focal signal abnormality identified. Significant bilateral parietal lobe volume loss, slightly more prominent on the left, and correlated with local reduced perfusion in those areas. Mesial temporal lobes appear normal. No evidence of restricted diffusion.
No extra-axial collections or mass are evident.
Conclusion: The presence of bilateral parietal lobe volume loss in the this age group and clinical setting favours Alzheimer's disease as the most likely diagnosis.