Sonographic atypical vascular coiling of the umbilical cord.

Objective: To investigate whether an atypical umbilical coiling pattern at prenatal sonography is associated with adverse pregnancy outcome.

Methods: A targeted sonographic evaluation of the umbilical cord (UC) was performed in 758 women with singleton gestation, and gestational age above 20 weeks. Atypical coiling was defined as the presence of a spring-shape UC (supercoiling) or an unusual, aperiodic coiling pattern (uncoordinated coiling).