normal MRI Brain Scan, single small  brain met , single met:  here , here, and here,  small, single brain met , large single brain met , large cystic single met, necrotic met,  single met with bleeding (hemorrhage), unusual brain met here

multiple (2 large mets), more multiple cases:  here,  here, here, here , multiple (many small lesions) , large single met , multiple brain mets from breast cancer: patient   #1 and patient #2

brain mets that eroded through the skull here and an extradural met pushing into the brain here
 

unusual metastases to the midline in the third ventricle, from lung cancer

large cystic brain metastasis from lung cancer