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Fallopian tube, also called oviduct or uterine tube, either of a pair of long narrow ducts located in the human female abdominal cavity that transport the male sperm cells to the egg, provide a suitable environment for fertilization, and transport the egg from the ovary, where it is produced, to the central channel (lumen) of the uterus.
The blockage is caused by an adherent plug of mucus that forms over the opening of the fallopian tube(s). In some women, injecting the contrast for the HSG will dislodge the plug with immediate opacification of both of the tubes. Therefore, for some women they only need the HSG to open their tubes.