الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A low-lying or previa placenta is a potentially fatal condition for both mother and child. Transvaginal sonography is the standard exam for its diagnostic and follow-up purposes.
The aim of this work was to assess various sonography predictors for the migration of the low located placentae and risk factors linked with its persistence in the last trimester of pregnancy.
Eighty two women who complied with all inclusion criteria were included in this study, and they were followed for 11 months, from November 2021 to October 2022. The most frequent risk factors were multigravidity in 95.1%, multiparity in 63.6%, a previous caesarean section in 57.3%, advanced maternal age in 36.5%, and a history of dilatation and curettage in 32.9%. By LMP and transabdominal ultrasonography, the diagnostic window for low-positioned placentas in the second trimester ranged from 20.14 to 24.0 weeks and 20.14 to 24.14 weeks
Revaluation by transvaginal ultrasound exams have been carried out between 34.0 and 38.57 weeks.
In our study, low lying placenta constituted 76.8% of the total while placenta previa made up 23.2. The placenta’s posterior position had a higher representation (56.1%). Resolution of the placenta occurred in 80.5% of all the study cases, with 87.3% in low-lying placentas and 57.9% in placenta previa. The cut-off value to expect resolution in low-lying placentas was greater than 6 mm in the anterior low-lying placenta and greater than 13 mm in the posterior low-lying placenta.
All cases of 2nd trimester placenta previa resolved with an overlap of less than 20 mm in the anterior placenta and 15 mm in the posterior placenta was associated with negligible risk of placenta previa.
Commonly, the risk factors for persistent low lying and placentae previa included an overlap of greater than 40mm, multigravida, prior caesarean section, advanced maternal age, and multiparity.
Our research leads us to the conclusion that the majority of low-lying placentas in the 2nd trimester migrate during the third trimester, and that the migration is correlated with the internal os distance and placenta overlap. To rule out probable risk factors for persistent placenta previa, a thorough history must always be taken.