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The ultrasonic aspects of polyhydramnios.

SUMMARY 
 
In a consecutive series of 250 patients with polyhydramnios, there were 242 patients with chronic and 8 with acute polyhydramnios. The incidence of fetal abnormality in association with chronic polyhydramnios was 18.4% (49 patients); 64% of these abnormalities had features recognisable by ultrasonography but only 28% could have been positively diagnosed by plain radiography. Acute polyhydramnios was associated with uniovular twins, and 2 of the 10 infants were malformed. This study demonstrated that ultrasonography has a greater diagnostic role than radiography in the patient who presents with polyhydramnios.