Large heterogenous cystic mass right posterior parieto-occipital lobe with marked peritumoral edema and adjacent mass effect compressing brain parenchyma.  Mass shows peripheral ring enhancement with central necrosis.  No ventricular compression or midline shift. 
Rest of brain parenchyma appear normal with no other enhancing lesion.   
Findings consistent with large cystic Astrocytoma / Glioblastoma Multiforme or cystic metastasis.  
 