A peripherally-enhancing, multi-septated lesion within the left parietal lobe is surrounded by vasogenic oedema with positive mass effect. The central non-enhancing components are heterogeneously T2 hyperintense with incomplete suppression on FLAIR, and demonstrate diffusion restriction. There is a thin rim of susceptibility.
There is some increased cerebral blood volume at the posterolateral aspect of the lesion, however, the lesion and surrounding white matter predominately demonstrate significantly reduced cerebral blood volume.
Spectroscopy reveals an elevated lactate peak.
There is partial effacement of the left lateral ventricle occipital horn, with mild enlargement of the left lateral ventricle temporal horn, suggestive of entrapment. No ependymal enhancement or abnormal diffusion restriction within the ventricles to suggest ventriculitis.
Conclusion: left parietal peripherally-enhancing lesion has appearances of a cerebral abscess.