Overview
Tumours arising from brain cannot be classified strictly into benign or malignant.
Even 'Benign' tumours account for significant morbidity and mortality, as they can continue to grow and cause the adverse effects of any space-occupying lesion.
The preferred terms are 'high-grade tumour' (a tumour that grows rapidly and is aggressive) and 'low-grade tumour' (a tumour that grows slowly but which may or may not be successfully treated).
Also cancers from other sites can spread (metastasize) to brain and cause symptoms- Brain metastasis