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The incidence of true knot of the umbilical cord has been reported to occur in 0.3-2.1% of all deliveries 1 and the frequency of antepartum fetal death is four 2,3 to ten 4 times higher in these fetuses. True knot of the umbilical cord often remains undiscovered prenatally because it is not associated with a characteristic clinical or in-utero ultrasound sign 5 . We describe the prenatal diagnosis of a true knot of the umbilical cord which we achieved in five cases using a new sonographic sign.During ultrasound examination of the umbilical cord, an unusual multicolored pattern was detected on color flow imaging. Detailed investigation showed a transverse

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A family with absent tibiae, triphalangeal thumbs and polydactyly is described. Bilateral absence of tibiae is the most severe manifestation of this syndrome. The pedigree of this family suggests an autosomal dominant inheritance with variable expression. Prenatal diagnosis was made at 20.5 weeks of pregnancy. Fetal radiographs showed the presence of both tibiae; this finding was confirmed at birth.

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