Megalourethra: A report of three cases associated with maternal diabetes and a review of the literature—is sonic hedgehog the common pathway?

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Abstract
The mechanisms by which maternal diabetes causes malformations in the offspring have yet to be elucidated. The purpose of this report is twofold: first, to describe three male infants born with multiple congenital anomalies and megalourethra, a defect which has not been previously reported in infants of women with diabetes; and second, to indicate that the defects seen in association with megalourethra in these three infants are similar to those seen as a consequence of abnormalities in sonic hedgehog, suggesting that maternal diabetes may affect sonic hedgehog expression in susceptible tissues during critical stages of development. Published 2004 Wiley‐Liss, Inc.