Table 1. Summary of preoperative work-up for brain metastasis.

Clinical status		Brain imaging		Others
Evaluation for general medical status		CT		CSF cytology
	- Heart, lung, kidney, liver function and etc.		- Bony structure	Spine MRI: if positive, reconsider surgery
Discussion with oncologists and radiation-oncologists			- Angiography: proximity with important vasculature
Discussion for less invasive treatment		Brain MRI
	e.g.) stereotactic radiosurgery		- Contrast enhancement
DS-GPA			- Acquisition of thin sliced image
	Age		- Functional imaging
	KPS		- Diffusion tensor imaging
	Extracranial metastasis	Conventional angiography, if needed
	Number of brain metastasis
	Genetic alteration of each cancer

DS-GPA, disease-specific graded prognostic assessment; KPS, Karnofsky Performance scale; CSF, cerebrospinal fluid