<s>[INST] I need help big time my mother is a patient of UVA currently and they are unable to appropriately diagnosis her we believe tha her cancer has come back but the doctors are unable to do MRI due to pacemaker I belive it is in her brain she has had a total personality and mood change [/INST] If an MRI of brain cannot be done due to pacemaker then a CT scan of head is an alternative to investigate for brain metastasis. Please discuss it with your doctor. </s>