Blighted ovum is:
In missed aboion ultrasound will show a gestational sac smaller than expected with irregular and crenated margin. An embryonic pregnancy (blighted ovum )is considered when there is a gestational sac more than 16 mm in diameter without a foetal node.(refer pgno:146 sheila 2 nd edition)
Synaptic knobs
Avascular villi
Intervillous hemorrhage
None of the above
General obstetrics