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Previous Volume 349:1389-1390 October 2, 2003 Number 14 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: The "compound" umbilical-cord knot reported by Camann and Marquardt (July 10 issue)¹ is topologically two distinct knots that were probably "tied" at separate times. First, an overhand knot probably formed as the fetus passed through a loop in the cord, creating the lump at the upper left of the compound knot. Subsequently, a figure-eight knot² probably formed when the fetus passed through a second loop whose base retained a half-twist. Not necessarily immediately, they snugged together into what presents as a compound knot.

Could the two component knots have been tied simultaneously? It is unlikely, but if . . . [Full Text of this Article]

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