This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ecotopic Pregnancy, Subject name: Gynaecology & Obstetrics
Leash sign is found in 
Select and explain. 
A. Ectopic Pregnancy, B. Vulvovaginitis, C. Polyhydramnios, D. Tubercular Salpingitis
A: Ectopic Pregnancy
Answer: A: Ectopic Pregnancy 
Explanation: Ans. A. Ectopic PregnancyAll cases of ectopic pregnancies had a typical eccentric leash of vessels on color Doppler that showed a low resistance placental type of flow on spectral Doppler. This is called leash sign. This sign has a sensitivity of 100% and specifity of 99% a positive predictive value of 95% and negative predictive value of 100% thus helping in the diagnosis of early ectopic pregnancy, and resulting in earlier treatment with reduced morbidity and mortality.