Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
Q: Abstract: We did complete histologic study on 148 gravid tubes and found that nearly 90% showed chronic lesions. CS was the most frequent lesion encountered (95.5%), followed by SIN (32.6%). Most frequently the lesions were extensive and both the ampulla and isthmus were involved. We therefore question the conservative approach in the treatment of certain TPs.
A:
Tubal causes of ectopic pregnancy.