Brain tumors are classified as primary, those that arise in the brain, or secondary, those that have spread to the brain from another part of the body. In the United States, about 24,000 people per year are diagnosed with a primary brain tumor. Primary brain tumors usually develop from glial cells, which provide the structural backbone of the brain and support the function of neurons. Most primary brain tumors in adults have no clear risk factors identified.Brain tumors can produce symptoms due to local brain invasion, compression of healthy brain structures and by increasing pressure within the brain (increased intracranial pressure). Symptoms vary based on what parts of the brain are involved.
Brain metastases are lesions in the brain from the spread of cancer from other organs to the brain.
Hemorrhage (bleeding) in the brain is when a blood vessel breaks and bleeds into the brain tissue. A brain hemorrhage is most commonly caused by high blood pressure, ruptured aneurysms, malformations of the blood vessels of the brain and amyloid angiopathy (protein deposits in the brain blood vessels).
The growth of abnormal cells in the tissues of the brain. Brain tumors can be benign (not cancer) or malignant (cancer).
Breast calcifications (hard, dense, calcium deposits within the breast) appear as white spots on imaging.
Breast cysts are fluid-filled sacs inside the breast. They are usually noncancerous (benign). Although breast cysts can be found in women of any age, they're more common in women before menopause, typically under age 50. Breast cysts also commonly occur in postmenopausal women who take hormone therapy.
