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1
Clinical Maternal-Fetal Medicine
The presence of placental tissue at or over the internal cervical os defines
placenta previa. Placenta previa is classified as marginal when the placental
edge reaches but does not cross the internal os; partial when the placenta covers
part of ...
Hung N. Winn, John C. Hobbins, 2000
2
Diagnostic Imaging of Fetal Anomalies
Identification of the communicating vessels is also important to ensure that they
do not cover the cervix to form a vasa previa. Differential Diagnosis An accessory
lobe may be simulated by a subchorionic hemorrhage or, less likely, from a ...
3
Pregnancy at Risk Current Concepts, (FOGSI)
Third trimester bleeding complicates about 3.8 percent of all pregnancies, with
placenta previa constituting about 25 to 30 percent of these cases. Definition and
Classification Placenta previa is defined as the placenta that is implanted over or
...
4
Obstetrics and Gynecology
Causes of Bleeding in the Second Half of Pregnancy Vulva Varicose veins Tears
or lacerations Vagina Tears or lacerations Cervix Polyp Glandular tissue (normal
Cervicitis Carcinoma Intrauterine Uterine rupture Placenta previa Placental ...
Charles R. B. Beckmann, 2010
5
Duke Radiology Case Review: Imaging, Differential Diagnosis, ...
DIFFERENTIALDIAGNOSIS Placenta previa should be considered whenever
placental tissue overlies the region of the cervix at ultrasonography. False-
positive diagnoses of placenta previa are common and must be considered prior
to ...
James M. Provenzale, Rendon C. Nelson, Emily N. Vinson, 2012
In placenta previa, the placenta lies over or near the cervical os (Figure 11—2).
There are three classes of placenta previa (Hull 8: Resnick, 2009): l. Marginal
placenta previa (also called low—lying placenta previa) in which the placenta
lies ...
Lynna Littleton-Gibbs, Joan Engebretson, 2012
7
Ultrasound: A Practical Approach to Clinical Problems
Figure 24-7 Lower uterine contraction simulating placenta previa. (A)
Longitudinal transabdominal sonogram of the lower uterus demonstrates
placental tissue (P) apparently overlying the region of the cervix. Closer scrutiny
of the image, ...
Edward I. Bluth, Carol B. Benson, 2011
8
Chinese Medical Obstetrics
Placenta previa refers to a placenta which has implanted over or too near the
cervix. This condition occurs in approximately 0.5% of pregnancies and usually in
multi- paras, in patients who have had a previous cesarean section, or in patients
...
9
Maternal, Neonatal, and Women's Health Nursing
C. Placenta completely covers cervical os. 3. Low-lying placenta in which the
exact relationship of the placenta to the cervical os is not determined, or in the
case that an apparent placenta previa occurs before the third trimester of
pregnancy.
Lynna Y. Littleton, Joan Engebretson, 2002
10
Ultrasonography in Obstetrics and Gynecology: A Practical ...
Patients with placenta previa typically present with painless third-trimester
vaginal bleeding. Fewer than half of patients who experience painless vaginal
bleeding, however, have placenta previa.2 Ultrasound has long been considered
a ...
Carol B. Benson, Edward I. Bluth, 2011
