 Detection of cognitive impairment in patients with brain metastases is important for both patient management and clinical trials. The most commonly used cognitive screen, the Mini Mental State Examination (MMSE), though convenient, is not sensitive in these patients. More sensitive tools are less convenient and, therefore, uncommonly used. Therefore, a practical and sensitive tool is needed. The Montreal Cognitive Assessment (MoCA) is a good candidate, shown to be sensitive in detecting mild cognitive impairment in the pre-dementia setting. This study is the first to explore the MoCA in cancer patients and is aimed at determining the feasibility of administering the MoCA in brain tumor patients. The secondary objective is to explore the relationship between MoCA and MMSE scores.