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William F. Mengert, M.D.
JAMA. 1932;99(6):469. doi:10.1001/jama.1932.27410580003008c.
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The occurrence of endometriomas in laparotomy scars, especially those following cesarean section, is sufficiently rare to warrant reporting. There have been a number of good reviews of the literature by Nicholson,1 Heaney,2 Lemon and Mahle,3 Vassmer,4 Pratt,5 and more recently Hosoi and Meeker,6 which indicate that there are less than a hundred such reports available. Hosoi and Meeker,6 who have collected eighty-seven cases of endometriomas occurring in laparotomy scars, report only twenty-one in which the pregnant uterus had been opened. It is interesting that cesarean section plays such a relatively small antecedent rôle in the formation of these tumors. Possibly the decidua is not adapted for independent growth immediately after parturition, when all pelvic structures are undergoing involution.


History.  —A white woman, aged 31, a secundigravida, reentered the obstetric and gynecologic service of the University Hospital, March 18, 1930, complaining


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