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Within the past ten years our notions in regard to ectopic pregnancy have been considerably modified: from being considered a very rare accident, it has come to be recognized as comparatively frequent; the older ideas as to its location have been largely given up; primary abdominal pregnancy is held by most recent writersas impossible and an ovarian one as at least very dubious. The tendency now is to consider all extra-uterine gestation as originating at least in the tubes, whatever its subsequent fate may be. The causes of the condition are, on the other hand, still debatable, and no one theory is admitted as generally acceptable. It is easy enough to suppose a mechanical obstruction preventing the passage of the impregnated ovum to the uterus, but the majority of cases of tubal pregnancy occur at or very near the ampullar extremity of the tube instead of in its middle or
THE THEORIES OF ECTOPIC PREGNANCY. JAMA. 1897;XXIX(4):190–191. doi:10.1001/jama.1897.02440300042006
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