We report the prenatal sonographic diagnosis of hydrometrocolpos caused by an imperforate hymen in a Down syndrome fetus, with spontaneous evacuation on the third day of life. In this case, sonographic evaluation in the 37th week revealed a large retrovesical, sharply marginated, heterogeneous, unilocular cystic structure within the fetal abdomen extending to the left side of the umbilicus. (C) 2011 Wiley Periodicals, Inc.
J Clin Ultrasound 39: 169-171, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/jcu.20785