The conclusions at which we arrive are the following:

1. Nodular enlargement of the tube can be caused by a number of different pathological conditions.

2. Clinical examination does not enable us to make a diagnosis of the pathological condition existing in an individual case of nodule of the tube.

3. The diagnosis of the nature of a tubal nodule can be made only with the microscope.

4. The conditions causing nodular enlargement of the tube are congenital or acquired, non-inflammatory or inflammatory.

5. Any one of these conditions can exist without the production of nodules.

6. The nodules can be found in all parts of the tube and—taking the peculiar anatomy of each part of the tube into account—show the same structure.

7. The enlargement can be caused by epithelial or epithelioid formations, connective or muscular tissue, by round-cell infiltrations or combinations of two or more of these.

8. The epithelial formations originate in the epithelium of

a. the tubal mucous membrane (salpingitis pseudo-follicularis, adenomyoma originating in the tubal epithelium).

b. the accessory tubes (intraparietal parasalpinx and hydro-parasalpinx).

c. remnants of the Wolffian body (adenomyoma).

9. The epithelioid formations originate in the peritoneal endothelium (peritoneal growths under "relative heterotopy").

10. The excess of formation of connective tissue is a consequence of inflammatory conditions of the tubal wall (salpingitis interstitialis, Zweifel).

11. The hypertrophy of the muscular tissue is

a. non-inflammatory (adenomyoma).

b. consequent upon inflammation—Kaltenbach's case (23).

12. The accumulations of round cells are direct evidence of inflammation:

a. non-specific (salpingitis interstitialis disseminata, salpingitis abscedens); or

b. specific (salpingitis tuberculosa or s. gonorrhoica).

13. The epithelioid formations can occur wherever pseudo-membranes cover organs lined with a serous coat.

14. Extra-uterine pregnancy (abdominal or tubal) produces epithelioid formations by causing pseudo-membranes to form—not by any irritation peculiar to the pregnancy.

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