Increased Incidence and Recurrence of Recent Corpus Luteum Without Ovulation Stigma (Luteinized Unruptured Follicle Syndrome?) in Baboons With Endometriosis

T M D'Hooghe, Thomas D’Hooghe, D'Hooghe TM, Bambra CS, Charanjit S. Bambra, C S Bambra, Raeymaekers BM, B M Raeymaekers, Barbara M. Raeymaekers, Koninckx PR, Philippe R. Koninckx, P R Koninckx
Journal of the Society for Gynecologic Investigation · 1996 · vol. 3(3) , pp. 140–144 · doi:10.1177/107155769600300307 · PMID:8796822 · W2038938650
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⚙ AI-generated summary by claude@2026-06, 2026-06-08 ⓘ

This study found an increased incidence and recurrence of luteinized unruptured follicles in baboons with endometriosis, potentially indicating a link to luteinized unruptured follicle syndrome.

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Abstract

ObjectiveTo test the hypothesis that a recent corpus luteum (CL) without fresh ovulation stigma (OS) can be found with a higher incidence and recurrence in baboons with endometriosis and is associated with a reduced egg recovery rate after uterine flush.MethodsOne hundred thirty-eight laparoscopies were performed in the early luteal phase of 52 cycles in 32 female baboons with a normal pelvis (controls) and of 86 cycles in 21 animals with endometriosis. The incidence and recurrence of a recent CL without OS was studied during each laparoscopy and during the first three laparoscopies in 15 baboons (five controls, ten with endometriosis), respectively. The association between the presence of a recent CL without OS and the egg recovery rate was evaluated during 65 cycles in 21 baboons after uterine flush.ResultsWhen all 138 laparoscopies were analyzed, the incidence of a recent CL without OS was higher (P < .03) in animals with stage II-IV endometriosis (35%) than in those with stage I disease (19%) or controls (11%). Both the incidence (seven of ten) and recurrence (three of ten) of a recent CL without OS were higher in baboons with endometriosis than in controls (zero of five, P < .02) when studied during the first three laparoscopies. Laparoscopies in primates having a recent CL without OS were associated with a lower egg recovery rate (13%) than in animals with recent CL and OS (54%, P = .005).ConclusionA recent CL without OS was associated with a reduced egg recovery rate and could be found with a higher incidence and recurrence in baboons with endometriosis than in controls, suggesting that luteinized unruptured follicle syndrome exists and could contribute to endometriosis-associated subfertility.

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Condition tags

endometriosis

MeSH descriptors

Endometriosis Ovarian Diseases Primate Diseases Animals Corpus Luteum Endometriosis Endometriosis Endometriosis Female Incidence Laparoscopy Laparoscopy Ovarian Diseases Ovarian Diseases Ovarian Follicle Ovulation Papio Recurrence Syndrome

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