Prevalence and Incidence of Choriocarcinoma
Choriocarcinoma: Rare Disease
Choriocarcinoma is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Choriocarcinoma, or a subtype of Choriocarcinoma,
affects less than 200,000 people in the US population.
Choriocarcinoma Prevalence: Book Excerpts
Prevalence/Incidence of Choriocarcinoma: Online Medical Books
16 MEDICAL BOOKS ONLINE!
Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Choriocarcinoma.
Placenta previa:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
In placenta previa, the placenta may cover all (total, complete, or central), part (partial or incomplete), or a fraction (marginal or low-lying) of the internal cervical os. The degree of placenta previa depends largely on the extent of cervical dilation at the time of examination because the dilating cervix gradually uncovers the placenta. (See Three types of placenta previa.) Although the specific cause of placenta previa is unknown, factors that may affect the site of the placenta’s attachment to the uterine wall include:
❑ defective vascularization of the decidua
❑ multiple pregnancy (the placenta requires a larger surface for attachment)
❑ previous uterine surgery
❑ multiparity
❑ advanced maternal age.
In placenta previa, the uterus’ lower segment fails to provide as much nourishment as the fundus. The placenta tends to spread out, seeking the blood supply it needs, and becomes larger and thinner than normal. Eccentric insertion of the umbilical cord often develops, for unknown reasons. Hemorrhage occurs as the internal cervical os effaces and dilates, tearing the uterine vessels.
This disorder, one of the most common causes of bleeding during the second half of pregnancy, occurs in approximately 1 in 200 pregnancies, more commonly in multigravidas than in primigravidas.
» READ BOOK EXCERPT ONLINE »
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.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Choriocarcinoma usually refers to the estimated population
of people who are managing Choriocarcinoma at any given time.
The term 'incidence' of Choriocarcinoma refers to the annual diagnosis rate,
or the number of new cases of Choriocarcinoma 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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