[Morphological causes of tubal pregnancy]

Histological examination was done of 103 fallopian tubes removed surgically due to tubal pregnancy. The examinations were done for finding the causes of abnormal nidation of the fertilized ovum. Sections were taken semiserially. The most frequent change (54.3% of cases) was presence of chronic inflammation with infiltrations composed of lymphocytes and plasma cells, and adhesions between the mucosal folds. Foci of decidual transformation in tubal wall were found in 13.6%, diverticula in 9.7%, and foci of tubal endometriosis in only 2.9% of cases. It is postulated that histological diagnosis should include, besides information on the presence of fertilized ovum, also a description of associated lesions which could be responsible for abnormal nidation.