A small well defined ring enhancing round to oval cystic mass right thalamus and midbrain region. it shows uniform wall enhancement with central cystic necrosis.  Mild peritumoral edema and mass effect, mild compression on adjacent third ventricle.   No midline shift. 
Rest of brain parenchyma appear normal. 
Differentials include Cystic Glioma  /  cystic metastasis / or abscess.  
 
 