Have the products of conception been evacuated in this spontaneous abortion

Transabdominal ultrasound shows almost complete evacuation of the products of conception. But what is that anechoic area in the fundus of uterus?

We did a transvaginal ultrasound to check it out. 

Just minimal fluid in the endometrial cavity. Not unusual after a complete abortion. 

Color Doppler ultrasound further confirms no abnormal vascularity in the uterus. 

Final diagnosis:

Complete abortion with no residual products of conception.

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Early pregnancy ultrasound