Treatise on gynaecology : medical and surgical . tes, to give placelater to a fluid exudation. It is easy to differentiate the two anatom-ical types. Without absolutely denying other methods of origin, I believe TUMOES OF THE VAGIJSTA. 287 them to be excessively rare. I must not omit to mention that Porak ^*reports a case of hydatid cyst of the vagina. Etiology.—Vaginal cysts are found at every age, and in virgins aswell as in women who have borne children. We think the agency ofexcessive coitus as • suggested by Courty to be very doubtful. Labormay have a certain determining influence, not in
Treatise on gynaecology : medical and surgical . tes, to give placelater to a fluid exudation. It is easy to differentiate the two anatom-ical types. Without absolutely denying other methods of origin, I believe TUMOES OF THE VAGIJSTA. 287 them to be excessively rare. I must not omit to mention that Porak ^*reports a case of hydatid cyst of the vagina. Etiology.—Vaginal cysts are found at every age, and in virgins aswell as in women who have borne children. We think the agency ofexcessive coitus as • suggested by Courty to be very doubtful. Labormay have a certain determining influence, not in consequence of trau-matism of the vagina, but by the over-nutritive activity of the wdiolegenerative tract caused by pregnancy, which has its proportional in-fluence upon the abnormally persisting embryonal remains as well asupon the epithelium covering the folds and crypts of the vaginalmucous membrane. Patliological Anato7ny.—Cysts of the vagina are most frequentlysingle. Several cysts were present in only 28 of the 122 cases collected. Fig. 70.—Section op the Wall of a Cyst op the Vagina (Schroeder). The external surface showsthe pavement epithehum of the vagina ; the internal, the cylindrical epithehum of the cyst. by Poupinel,^^ or 22^. The number very rarely exceeds three or has reported one case in which fifteen were agglomeratedinto a single tumor, but he reasonably ascribes this to a pseudo-glan-dular formation. The cysts which develop from the Wolffian bodyare single, as a rule, rarely multiple, and then disposed one after theother in a row (Johnston).^ Their size varies between that of a peaand a turkeys egg. Yeit has seen one the size of the foetal most frequent location is the upper portion of the -anterior orposterior vaginal wall. In one case, that of Bastelberger,!^ the hymenformed part of the wall of the cyst. Sometimes the cavity has a pro-longation superiorly. In the case of Watts,^^ so frequently quoted,the sound when introduc
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