An intracranial tumor is any abnormal mass of tissue located within the cranial cavity. These tumors can originate from brain tissue (primary brain tumors), or they may spread from cancers elsewhere in the body (metastatic brain tumors). Intracranial tumors may be benign or malignant, and their clinical effects depend on their size, location, growth rate, and involvement of critical brain structures. Common symptoms include headache, seizures, cognitive changes, and neurological deficits.