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Subtle distal Fallopian tube abnormalities comprise a group of diseases that are characterised by subtle variations in tubal anatomy. This prospective cohort study investigated the prevalence of subtle distal Fallopian tube abnormalities in the infertile population and their relationship with endometriosis. It was conducted in a single fertility referral centre between January 2017 and December 2018 and included all infertile patients who underwent laparoscopy. Subtle distal Fallopian tube abnormalities included fimbrial agglutination, tubal diverticula, accessory ostium, fimbrial phimosis, and accessory Fallopian tube. A total of 876 patients were enrolled in the study, and 251 cases (28.65%; mean age: 29.4 ± 4.7 years) were diagnosed with subtle tube abnormalities. A total of 179 of these cases presented only one type of abnormality, 62 presented two types of abnormalities, and 12 presented three types. Tubal fimbrial agglutination composed the largest group (62.2%; n = 156), followed by tubal diverticula (26.3%; n = 66), fimbrial phimosis (25.5%; n = 64), tubal accessory ostium (15.5%; n = 39), and tubal accessory ostium (15.5%; n = 39). An accessory Fallopian tube was the least common abnormity (4.8%; n = 12). A total of 70.9% (178/251) of the women with subtle tubal abnormalities had endometriosis. The prevalence of subtle distal Fallopian tube abnormalities in the stage I-II group was significantly higher than in the stage III-IV group (57.3% [149/260] vs. 20.9% [29/139]; p < 0.001). These findings indicate the high prevalence of subtle distal Fallopian tube abnormalities in the infertile woman. This group of diseases is highly related to endometriosis and may indicate fimbrial abnormalities of endometriosis. [ABSTRACT FROM AUTHOR]

Aim: To investigate the distribution of tubal endometriosis (EM) in the right and left sides and four parts of the fallopian tube. Methods: A retrospective, cross‐sectional study was conducted on patients with tubal EM at the Fourth Affiliated Hospital of Guangxi Medical University from October 2011 to September 2021. Chi‐square and binomial tests were used for analysis. Results: Thirty‐four patients (53.97%) had tubal resection due to EM (EM group). Twenty‐nine patients (46.03%) had tubal resection due to non‐EM (non‐EM group). Thirty‐two patients (50.80%) had left fallopian tube EM, 21 (33.33%) had right fallopian tube EM, and 10 (15.87%) had bilateral fallopian tube EM, with significant differences among them (p = 0.000). In the EM group, 15 patients (44.12%) had left fallopian tube EM, 13 (38.23%) had right fallopian tube EM, and 6 (17.65%) had bilateral fallopian tube EM (p = 0.052). In the non‐EM group, statistically different (p = 0.001) diagnoses of left fallopian tube EM, right fallopian tube EM, and bilateral fallopian tube EM were 17 (58.62%), 8 (27.59%), and 4 (13.79%), respectively. In the EM group, 18 patients (52.94%) were in the ampullary region; 16 (47.06%) were in the nonampullary region (p = 0.864). In the non‐EM group, 22 cases (75.86%) were in the ampullary region and 7 (24.14%) were in the nonampullary region, with a significant difference between them (p = 0.008). Conclusions: The incidence of left fallopian tube EM was higher than that of right and bilateral fallopian tube EM. The incidence of tubal ampullary EM was higher than that of nonampullary region. [ABSTRACT FROM AUTHOR]