Primary<unk> s include any tumor that starts in the<unk> . Primary<unk> s can start from<unk>  cells, meninges, nerves, or glands.<unk> s can be classified into two main categories: primary and secondary tumors. Primary tumors originate in astrocytes, oligodendrocytes and ependymal cells. Secondary tumors originate in malignant cancers located primarily in other organs. The cause of<unk> s is unknown. These cancers should be differentiated from essential tremor, stroke, chronic subdural hematoma, meningitis, orbital optic neuritis, arteriovenous malformations and<unk>  abscesses. Radiation is one the common risk factors for<unk> s. The complications of<unk> s are<unk>  herniation, loss of<unk>  function and recurrence. The most common symptoms of<unk> s are headache, seizures, visual changes and changes in personality, mood and concentration. On head CT scan,<unk>  cancer is characterized by hypodense mass lesions. On MRI<unk> ,<unk>  is characterized by hypointense or isointense on T1-weighted scans, or hyperintense on T2-weighted MRI. The predominant therapy for<unk>  is surgical resection. Meningiomas, with the exception of some tumors located at the skull base, can be successfully removed surgically. In more difficult cases, stereotactic radiosurgery, such as Gamma Knife radiosurgery remains a viable option. Most pituitary adenomas can be removed surgically using a minimally invasive approach through the nasal cavity and skull base (trans-nasal, trans-sphenoidal approach). Larger pituitary adenomas require a craniotomy (opening of the skull) for their removal. Radiotherapy, including stereotactic approaches, is reserved for inoperable cases. Adjunctive chemotherapy and radiation may be required.
Brain tumor
Adult brain tumors
Brain stem tumor
Coma
Central nervous system infection
Spinal tumor
Brain abscess
Spinal cord tumor