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Placenta. 2013 Apr;34(4):391-3. doi: 10.1016/j.placenta.2012.12.002. Epub 2013 Feb 1.

Is the placental disk really an ellipse?

Author information

1
Department of Mathematics, University of Toronto, 40 St. George St, Toronto, Ontario M5S2E4, Canada.

Abstract

The mean surface shape of placenta is round and common abnormalities of shape are associated with vascular abnormalities and reduced placental functional efficiency. A long-standing approach is to describe shapes as elliptic, and to quantify them by "length" and "breadth". We test this description in two cohorts: National Collaborative Perinatal Project and Pregnancy, Infection and Nutrition Study. We conclude that quantifying placental shape as elliptic is ambiguous and problematic. The "breadth" of the placenta should be interpreted as a combination of two different measurements: placental size and irregularity of the placental surface. It has no intrinsic functional significance.

PMID:
23375234
PMCID:
PMC3602392
DOI:
10.1016/j.placenta.2012.12.002
[Indexed for MEDLINE]
Free PMC Article

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