THE INFREQUENCY of interstitial pregnancy has been the subject of much discussion, but when it occurs following an ectopic pregnancy it becomes worthy of a report, because of its extreme rarity.
Various figures have been reported with respect to the incidence of this abnormal condition. Crawford and Hutchinson1 reviewed the literature for a period of one decade and reported that interstitial location was noted in from 0.07 per cent to 6.3 per cent of all pregnancies. In their own series of 300 cases these investigators found fewer than 1.0 per cent. Keenan,2 as well as Leverton,3 quotes more or less the same percentage of occurrence of interstitial pregnancies, namely, 1.0 to 2.0 per cent of all ectopic pregnancies. The occurrence of interstitial pregnancy following salpingectomy is, of course, rare and makes up a small percentage of all interstitial pregnancies. D'Errico4 reviewed the literature extensively and
Kirschner R, Kimball HW. Interstitial Pregnancy Following Unilateral SalpingectomyA Case Report. JAMA. 1961;175(13):1180–1181. doi:10.1001/jama.1961.63040130012021a
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