The prenatal diagnosis of imperforate anus with rectourinary fistula: dilated fetal colon with enterolithiasis.J Pediatr Surg. 1992 Jan; 27(1):82-4.JP
The finding of extraluminal calcifications is commonly reported and usually indicates intrauterine intestinal perforation with intraperitoneal extravasation of meconium, most often associated with intestinal obstruction and/or atresias. Intraluminal calcification of meconium is more rare and appears to result from the mixing of stagnant urine and meconium in utero. The presence of the intraluminal calcifications in a dilated loop of intestine, particularly with an associated urinary tract abnormality, should suggest a rectourinary fistula. Two cases of prenatally diagnosed imperforate anus with rectourinary fistulae are reported.