This case brings a differential diagnosis approach commonly seen on radiology exams, where you should work-up relevant descriptors to entertain the possible causes:

• location
  • intra vs extra-axial 
  • supra vs infratentorial 
• single vs multiple 
• patten: ring-enhancing lesion
  • thick and nodular vs thin and smooth 
  • complete vs incomplete 
• age group: 
  • children vs young adult vs aduld/elderly 

Please, refer to the article on cerebral ring enhancing lesions for further discussion on differentials. 

This case was confirmed to represent breast cancer metastasis. The patient had a known history of previous mastectomy due to invasive ductal carcinoma.