The pathologic spectrum of uterotubal junction obstruction

Area of Science:

• Reproductive Medicine
• Pathology
• Gynecology

Background:

• Uterotubal junction (UTJ) obstruction is a significant cause of female infertility.
• Histological evaluation of UTJ pathology is crucial for understanding disease mechanisms.

Purpose of the Study:

• To investigate the histological spectrum of UTJ obstruction.
• To correlate pathological findings with clinical data in women with UTJ obstruction.

Main Methods:

• Histological examination of excised tubal segments from 42 women with UTJ obstruction.
• Use of connective tissue stains to confirm specific lesions like obliterative fibrosis and intramucosal endometriosis.

Main Results:

• Obliterative fibrosis was the most frequent lesion (38.1%), followed by chronic tubal inflammation (21.4%), salpingitis isthmica nodosa (23.8%), and intramucosal endometriosis (14.3%).
• Obstruction consistently involved the transmural and isthmic segments, not the ampullary segment.
• Intramucosal endometriosis was histologically distinct from salpingitis isthmica nodosa.

Conclusions:

• UTJ obstruction exhibits multiple distinct histological patterns.
• Intra-abdominal findings do not predict UTJ histology.
• Pregnancy history (intrauterine or ectopic) is not associated with a specific histological pattern.
• The obstruction likely originates within the uterus, with fibrosis potentially being a non-specific response to chronic injury.