Placental shelf

Dr Henry Knipe and Dr Yuranga Weerakkody et al.

A placental shelf refers to a ridge of placental tissue freely abutting the margin. It may represent part of a circumvallate placenta, although an early second-trimester placental shelf can be a common, benign and transient finding 1.

Placental shelves detected in early second-trimester are thought to rarely persist to mid-gestation and never to the third trimester.

Radiographic features


Typically seen as a peripheral uplifted rim of chorionic tissue appearing as an echodense ridge. 

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Article information

rID: 39899
System: Obstetrics
Section: Anatomy
Tag: cases
Synonyms or Alternate Spellings:
  • Placental shelves
  • Uplifted placental ridge
  • Uplifted placental rim

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