The fallopian tubes, also called uterine tubes or oviducts, are paired structures that extend from the upper corners of the uterus toward the ovaries. Their primary function is to capture the released egg during ovulation and provide the site where fertilization normally occurs. On transvaginal ultrasound, normal fallopian tubes are usually not visible because they are thin and surrounded by other pelvic structures. However, they become visible when distended with fluid, as in hydrosalpinx, or when a mass is present, as in an ectopic pregnancy or fallopian tube carcinoma. Identifying a dilated or abnormal fallopian tube is an important finding in pelvic ultrasound.
Sonography Term