True about ectopic pregnancy:
Transvaginal USG-first imaging test of choice
Not Associated with decidual reaction
Doppler is of no significance
In ectopic interstitial ring sign is seen
If TVS reveals an intrauterine gestational sac,the diagnosis of ectopic can usually be ruled out .sometimes a psuedosac may be seen in an ectopic due to bleeding produced by separation of a decidual cast.(refer pgno:159 sheila 2 nd edition)
General obstetrics