Low lying placenta

Low lying placenta occurs when the placenta extends into the lower uterine segment and its edge lies too close to the internal os of the cervix, without covering it. The term is usually applied when the placental edge is 0.5-5 cm from the internal cervical os 1. Some alternatively give the term when the placental edge is within 2 cm from the internal cervical os ref. It is also classified under the benign end of the spectrum of type 1 placenta previa.

Epidemiology

The estimated prevalence may be as high as 10-30 % of all pregnancies 2,7. The majority of placentas classified as low lying in early pregnancy (12-14 weeks) reach a normal position on subsequent scanning later during the pregnancy due to placental trophotropism.

Differential diagnosis

Situations that may mimic a low lying placenta on a trans-abdominal scan includes


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Article Information

rID: 13472
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Low lying placental position
  • Potential placenta previa

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    Figure 1: low lying placenta
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