Prevalence and Incidence of Parathyroid Cancer
Parathyroid Cancer Prevalence: Book Excerpts
Prevalence/Incidence of Parathyroid Cancer: Online Medical Books
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Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Parathyroid Cancer.
Hyperparathyroidism:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Hyperparathyroidism may be primary or secondary. In primary hyperparathyroidism, one or more of the parathyroid glands enlarges, increasing PTH secretion and elevating serum calcium levels. The most common cause is a single adenoma. Other causes include a genetic disorder or multiple endocrine neoplasia. Primary hyperparathyroidism usually occurs between ages 30 and 50 but can also occur in children and the elderly. It affects two to three times more females than males. It’s a common disorder, affecting 1 in 1,000 people.
In secondary hyperparathyroidism, excessive compensatory production of PTH stems from a hypocalcemia-producing abnormality outside the parathyroid gland, which causes a resistance to the metabolic action of PTH. Some hypocalcemia-producing abnormalities are chronic renal failure, renal absorption disorders, vitamin D deficiency (especially in the housebound elderly), or osteomalacia due to phenytoin or laxative abuse.
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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
About prevalence and incidence statistics:
The term 'prevalence' of Parathyroid Cancer usually refers to the estimated population
of people who are managing Parathyroid Cancer at any given time.
The term 'incidence' of Parathyroid Cancer refers to the annual diagnosis rate,
or the number of new cases of Parathyroid Cancer 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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