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brain tumourA neoplasm affecting the brain, which may be primary (arising in the brain or meninges) or secondary (i.e., metastatic to the brain).
Brain tumours are the 3rd most common malignancy in ages 15–34; 35,000 occur annually in the US. 1st-degree relatives of children with brain tumours have a 5-fold increased risk of CNS tumours, leukaemia and other childhood tumours in the affected family.
Seizures, vision or hearing loss, hemiparesis, double vision, headache, bizarre behaviour, nausea, vomiting, memory loss.
Mass lesion by all modalities—CT, MRI, PET, ultrasound.
Surgery, gamma knife radiotherapy may be effective; chemotherapy and immunotherapy are less so.
Generally poor, but depends on histological grading; malignant gliomas account for 2.5% of all cancer-related deaths.
• Non-neoplastic—craniopharyngioma, colloid cysts.
• Primary, benign—meningioma, pituitary adenoma, acoustic neuroma, epidermoid tumours, choroid plexus papilloma.
• Primary, low grade—pilocytic astrocytoma, astrocytoma, hemangioblastoma, oligodendroglioma, ganglioglioma.
• Primary, malignant—anaplastic astrocytoma, glioblastoma multiforme, ependymoma, lymphoma, medulloblastoma, primitive neuroectodermal tumour, germ cell tumour, pineal cell tumour, chordoma, choroid plexus carcinoma.
Carcinoma, meningeal carcinomatosis.
Location-specific symptoms of brain cancer
• Brainstem—vomiting, incoordination, difficulty with swallowing and speech, unilateral facial muscle weakness (e.g., crooked smile, drooping eyelid), crossed eyes, poor vision, morning headache, drowsiness, hearing loss, head tilt, hemiparesis, personality changes.
• Frontal lobe—seizures, impaired judgment and memory, changed personality or mental capacity, hemiparalysis, loss of sense of smell, impaired vision, swollen optic nerve or papilledema; if both hemispheres are involved, changed mental state or personality, uncoordinated gait.
• Parietal lobe—loss of ability to write; if tumour is in the left hemisphere, speech disturbances and seizures, loss of recognition of body parts, spatial disorders.
• Occipital lobe—directional blindness, seizures.
• Temporal lobe—may be asymptomatic; occasionally speech defects, seizures.
• Ependyma—hydrocephalus, ± neck stiffness, head tilt, multiple cranial nerve palsies.
• Meninges—symptoms specific to the region being compressed; metastatic brain tumours cause oedema resulting in headache, vomiting and nausea, as well as location-specific symptoms.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
brain tumourSecondary spread of cancer to the brain, from a primary tumour elsewhere in the body is common. Primary tumour, originating in the skull is less common. Primary tumours arise from the brain coverings (MENINGIOMAS), the neurological supportive tissue (GLIOMAS), the blood vessels (HAEMANGIOMAS), the bone (OSTEOMAS) or the pituitary gland (PITUITARY ADENOMAS). Some are of congenital origin (CRANIOPHARYNGIOMAS, TERATOMAS) and are due to abnormal development.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005