What it is

A brain tumour is a growth of abnormal cells in or around the brain. In children, they are the most common solid tumour. Because the brain controls so much — movement, balance, vision, speech — symptoms depend a great deal on where the tumour is.

Low-grade vs high-grade

Tumours are often described by how quickly they grow. Low-grade tumours grow slowly; high-grade tumours grow more quickly. The grade, type and location all help doctors plan the right care for your child.

Where they occur

• The cerebellum and brain stem (affecting balance and coordination)
• The cerebrum (affecting movement, senses and thinking)
• Near the pituitary gland or optic pathways (affecting hormones or vision)