Fig. 2.1

Brain MRI demonstrates multiple cystic lesions in the left thalamus, left parietal lobe, and corpus callosum. The largest lesion measures 23 × 33 × 15 mm in the left parietal lobe. MRI with and without contrast demonstrated heterogeneous signal characteristics: A: T1WI reveals slightly hyperintense cyst wall and hypointense cystic fluid; B: T2WI shows hypointense cyst wall and hyperintense cystic fluid; C: FLAIR sequence exhibits hyperintense signal within the cystic fluid; D: DWI demonstrates marked hyperintensity within the cystic fluid; E: ADC map shows markedly hypointense signal within the cystic fluid; F: Contrast-enhanced imaging displays ring-like enhancement of the lesions with interconnected cyst cavities