A woman was referred at 25 weeks' gestation with decreased fetal movem
ents. Ultrasound revealed a large solid fetal abdominal mass and gross
fetal ascites. Amniocentesis and viral titers were normal. On subsequ
ent ultrasound examinations, the mass and ascites slowly disappeared,
but a small bowel obstruction developed. Spontaneous labor occurred at
35 weeks and the child was born with a distended abdomen. Ar laparoto
my there was type 3 jejunal atresia, indicating that the fetal mass an
d ascites were secondary to this antenatal small bowel ischemia.