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Salpingitis is inflammation of the fallopian tubes and may be found alone, or as part of pelvic inflammatory disease (PID). A thickening of the fallopian tube at its narrow portion, due to inflammation, is known as salpingitis isthmica nodosa. Like PID and endometriosis, it may lead to fallopian tube obstruction. Fallopian tube obstruction may be a cause of infertility or ectopic pregnancy.