We report the case of a dipygus diagnosed by sonography in the second
trimester that had 6 lower extremities, double external male genitalia
, a megabladder, 3 dilated ureters, and a polycystic right and a pelvi
c left kidney. This complex malformation represents a rare type of cau
dal duplication. (C) 1998 John Wiley & Sons, Inc.