Pineal-region tumours are brain tumours that occur in the pineal region of the brain. You may also find our general information about brain tumours useful.
The pineal gland is found at the back of the third ventricle of the brain (see diagram below). Ventricles are fluid-filled spaces within the brain. The functions of the pineal gland are not fully understood but one function is to produce the hormone melatonin. Melatonin is involved in regulating the body’s 'internal clock', which controls when we sleep and when we wake.