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