IDIOPATHIC POLYHYDRAMNIOS

• In about 50% of cases no etiology can be determined for the increased fluid.
• Retrospective diagnosis.
• Polyhydramnios is not usually severe. There appears to be a relationship between the degree of polyhydramnios and the likelihood of a chromosomal abnormality.
• Repeat follow up ultrasound is recommended as not all anomalies are visualized at any given visit. There are some anomalies that only become apparent in the third trimester, and other anomalies like tracheo-esophageal fistula that can only be recognized during periods of esophageal dilatation.
• Even if no cause is found, polyhydramnios may be the only sign indicating maternal glucose intolerance (even when glucose values are normal). In many cases maternal glucose intolerance manifests at a later stage.
• Complications.
• Stillbirth rate is not increased.
• Increased frequency of premature labor.

Idiopathic polyhydramnios – normal stomach	Polyhydramnios- small stomach (microgastria). Fetus had esophageal atresia with distal tracheo-esophageal fistula