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Updated: May 14, 2026
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Three-dimensional Rendering and Analysis of Immunolabeled, Clarified Human Placental Villous Vascular Networks
Published on: March 29, 2018
Is the placental disk really an ellipse?
M Yampolsky1, C M Salafia, D P Misra
1Department of Mathematics, University of Toronto, 40 St. George St, Toronto, Ontario M5S2E4, Canada.
Placenta
|February 5, 2013
Summary
Quantifying placental shape using simple elliptic measurements is problematic. Placental "breadth" reflects both size and surface irregularity, not intrinsic function.
Area of Science:
- Reproductive biology
- Medical imaging
- Fetal development
Background:
- Placental shape is typically round, with abnormalities linked to vascular issues and reduced function.
- Elliptic descriptions using length and breadth are traditional but potentially flawed.
Purpose of the Study:
- To critically evaluate the traditional elliptic model for quantifying placental shape.
- To determine the functional significance of placental "breadth" measurements.
Main Methods:
- Analysis of placental shape data from two large cohorts: National Collaborative Perinatal Project and Pregnancy, Infection and Nutrition Study.
- Statistical assessment of the relationship between elliptic shape parameters and placental function.
Main Results:
- The elliptic model for placental shape quantification is ambiguous and problematic.
- "Breadth" is a composite measure of placental size and surface irregularity.
- Placental "breadth" lacks independent functional significance.
Conclusions:
- Traditional elliptic descriptors of placental shape are inadequate.
- "Breadth" should not be used as a sole indicator of placental health or function.
- Further research is needed to develop more accurate methods for assessing placental morphology and function.
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