Question

define brain tumer
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Answer 1

BRAIN TUMOR :-

A brain tumor is a collection, or mass, of abnormal cells in ourbrain. Our skull, which encloses brain, is very rigid. Any growth inside such a restricted space can cause problems.Brain tumors can be cancerous (malignant) or noncancerous (benign). 

Answer 2

the mass or growth of abnormal cells in one's brain is brain tumor