First trimester oligohydramnios
Antenatal early pregnancy scan at 5-6 weeks
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1st USG in primi patient. Single intra-uterine gestation sac and fetal pole present. Cardiac activity present - 111 beats / min.
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Size difference between gestational sac and crown-rump length is less than 5 mm. This is known as 'First trimester oligohydramnios'. There is increased risk of early pregnancy failure in such cases.
6 days after 1st USG - c/o spotting. USG showed no cardiac activity.
- CALLEN ULTRASONOGRAPHY in Obstretrics and Gynecology; 4th edition. Page 132.