All statistics for Tumor
Prevalence/Incidence of Tumor: Online Medical Books
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for more information about the prevalence and/or incidence of Tumor.
Malignant spinal neoplasms:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Primary tumors of the spinal cord may be extramedullary (occurring outside the spinal cord) or intramedullary (occurring within the cord itself). Extramedullary tumors may be intradural (meningiomas and schwannomas), which account for 60% of all primary malignant spinal cord neoplasms, or extradural (metastatic tumors from breasts, lungs, prostate, leukemia, or lymphomas), which account for 25% of these malignant neoplasms.
Intramedullary tumors, or gliomas (astrocytomas or ependymomas), are comparatively rare, accounting for only about 10%. In children, they're low-grade astrocytomas.
Spinal cord tumors are rare compared with intracranial tumors (ratio of 1:4). They occur equally in men and women, with the exception of meningiomas, which occur mostly in women. Spinal cord tumors can occur anywhere along the length of the cord or its roots.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Malignant brain tumors:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The cause of most brain tumors is unknown, but exposure to ionizing radiation is a known environmental risk. Additionally, most malignant tumors of the brain are of metastatic origin; 20% to 40% of patients with cancer develop brain metastasis.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Primary malignant bone tumors:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Causes of primary malignant bone tumors are unknown. Some researchers suggest that primary malignant bone tumors arise in areas of rapid growth because children and young adults with such tumors seem to be much taller than average. Additional theories point to heredity, trauma, and excessive radiotherapy.
For incidence information, see Comparing primary malignant bone tumors.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Pituitary tumors:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Although the exact cause is unknown, a predisposition to pituitary tumors may be inherited through an autosomal dominant trait. Pituitary tumors aren't malignant in the strict sense but, because their growth is invasive, they're considered a neoplastic disease.
Chromophobe adenoma may be associated with production of corticotropin, melanocyte-stimulating hormone, growth hormone (GH), and prolactin; basophil adenoma, with evidence of excess corticotropin production and, consequently, with signs of Cushing's syndrome; eosinophil adenoma, with excessive GH.
Pituitary tumors develop in 1 in 10,000 people. About 15% of tumors located within the skull are pituitary tumors.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Tumor usually refers to the estimated population
of people who are managing Tumor at any given time.
The term 'incidence' of Tumor refers to the annual diagnosis rate,
or the number of new cases of Tumor diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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