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In page Causes of mental disorders:

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Brain tumors are classified as either malignant and benign, and as intrinsic (directly infiltrate the parenchyma of the brain) or extrinsic (grows on the external surface of the brain and produces symptoms as a result of pressure on the brain tissue). Progressive cognitive changes associated with brain tumors may include confusion, poor comprehension, and even dementia. Symptoms tend to depend on the location of the tumor in the brain. For example, tumors on the frontal lobe tend to be associated with the sign of impairment of judgment, apathy, and loss of the ability to regulate/modulate behavior.[citation needed]