MRI
Axial T2
Axial FLAIR
Axial T1
Axial T1 C+ fat sat
Axial DWI
Axial ADC
Axial SWI
Axial MR Perfusion (CBV)
Sagittal T1 C+ fat sat
Coronal T1 C+ fat sat
A peripherally enhancing fluid-filled cavity in the right parietal lobe has a rim that is mildly irregular with mild nodularity, enhancing thin septations and susceptibility artefact. The internal fluid demonstrates layering. There is no diffusion restriction and no elevation of cerebral blood volume (CBV).
Mild adjacent FLAIR signal hyperintensity at the superior and inferior aspects. There is no large volume of oedema. Minimal mass effect. The posterior horn of the right lateral ventricle is effaced.
There is extensive superficial siderosis throughout the brain, most pronounced in the posterior fossa.
Conclusion:
Overall, the findings are most suggestive of a long-standing lesion with chronic or intermittent hemorrhage over time. A low grade/indolent cystic neoplasm (ie. ganglioglioma, PXA, pilocytic) are thought more likely than recurrent hemorrhage into a neuroepithelial cyst.