Diffuse astrocytoma with gliomatosis cerebri growth pattern
Headache, seizure, left side body weakness and sometimes nausea/vomiting.
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Cortico-subcortical abnormal signal intensity involving the right fronto-temporo-parietal lobes causing effacement of the right lateral ventricle. It is returning low to iso-signal in T1 WI, high signal in T2/FLAIR images without diffusion restriction in DWI and corresponding ADC map. No contrast enhancement is noted in the lesion in post contrast sequences.
The imaging features are in favor of a diffuse astrocytoma (probably IDH-wt given age) with gliomatosis cerebri growth pattern.
Note: In the 2016 update of WHO classification of CNS tumors, gliomatosis cerebri was removed as a stand-alone diagnosis.
Unfortunately histology is unavailable for confirmation.