<prompt> Ectopic pregnacny, characteristic finding in USG is:Absence of gestational sac in uterusComplex adenexal massResistance in coloured DopplerFree fluid in peritoneal cavity  <response>: A i.e. Absence of gestational sac in uterus Best method of diagnosing unruptured ectopic pregnancy is combination of transvaginal sonography quantitative B-HCG valuesQ. 