An examination reveals neurologic changes that are specific to the location of the tumor. Are also common signs of increased intracranial pressure. Some tumors may not show symptoms until they are large, then suddenly cause rapid deterioration of neurological functioning of the person. The original tumor (primary) and can be known or be discovered after an examination of tumor tissue in the brain indicates it is a metastatic type.

• A CT scan or MRI of the head can confirm the diagnosis of brain tumor and identify its location. MRI is usually more sensitive for finding tumors in the brain.
• Cerebral Angiography may be done occasionally. Doing so may show a mass that occupies space, which may or may not be highly vascular (filled with blood vessels).
• Make an X-ray, mammography and computed tomography of chest, abdomen and pelvis, as well as other tests to find the original tumor site.
• An EEG may reveal abnormalities.
• An examination of tumor tissue removed during surgery or CT-guided biopsy is used to confirm the exact type of tumor. If you can locate the primary tumor outside the brain, this tumor is that he and biopsied rather than the brain tumor.
• Sometimes also performed a lumbar puncture (spinal tap) to examine the cerebrospinal fluid.

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