Obstetric Ultrasound Normal Pregnancy Vs Placenta Previa | LowLying, Marginal, Partial, Complete

*Cases
LowLying Placenta 0:00
Marginal Placenta Previa 7:06
Partial Placenta Previa 9:29
Complete Placenta Previa 10:40

Placenta Previa
Abnormally low position of the placenta. Placenta lies closer to the cervix or covers it.

Causes:
Previous Cesarean Delivery
Multiple Pregnancies
Previous Placenta Previa
Maternal Age: Women over 35 years old are at higher risk.
Smoking
Uterine Surgery such as fibroid removal
In Vitro Fertilization (IVF)

Diagnosis:
SecondTrimester Ultrasound (1820 weeks): Placenta previa is more commonly identified during the midpregnancy ultrasound, usually around 18 to 20 weeks. However, some cases detected at this stage may resolve by the third trimester as the uterus grows and the placenta moves away from the cervix.
ThirdTrimester Ultrasound (2832 weeks): If placenta previa is suspected or diagnosed earlier in the pregnancy, followup ultrasounds are typically conducted around 28 to 32 weeks to see if the condition has resolved. Persistent placenta previa at this stage is more likely to continue to term and require special management.

LowLying Placenta: Placental edge is less than 2 cm from the internal os
Marginal Placenta Previa: Placenta touches the margin of the cervix but does not reach the internal os
Partial Placenta Previa: Placenta partially covers the internal os
Complete: Placenta completely covers the internal cervical os.