All statistics for Benign tumor
Prevalence/Incidence of Benign tumor: Online Medical Books
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for more information about the prevalence and/or incidence of Benign tumor.
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
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
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
Malignant melanoma:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Several factors seem to influence the development of melanoma:
❑Excessive exposure to sunlight — Melanoma is most common in sunny, warm areas and usually develops on parts of the body that are exposed to the sun.
❑ Skin type — Most persons who develop melanoma have blond or red hair, fair skin, and blue eyes; are prone to sunburn; and are of Celtic or Scandinavian ancestry. Melanoma is rare among Blacks; when it does develop, it usually arises in lightly pigmented areas (the palms, plantar surface of the feet, or mucous membranes).
❑ Hormonal factors — Pregnancy may increase risk and exacerbate growth.
❑ Family history — Melanoma is slightly more common within families.
❑ Past history of melanoma — A person who has had one melanoma is at greater risk of developing a second.
Melanoma is slightly more common in women than in men and is rare in children. Peak incidence occurs between ages 50 and 70, although the incidence in younger age-groups is increasing.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Benign tumor usually refers to the estimated population
of people who are managing Benign tumor at any given time.
The term 'incidence' of Benign tumor refers to the annual diagnosis rate,
or the number of new cases of Benign 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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