1 Department of Obstetrics and Gynecology, and Senior Scholar, Center Clinical Epidemiology and Biostatistics, University of Pennsylvania Medical Center, Philadelphia, PA 19104, USA. kbarnhart@mail.obgyn.upenn.edu
Three-dimensional imaging of the human vagina demonstrates that the cross section can be a "W," rather than an "H," and that intravaginal gel can ascend into the endocervix and presumably into the endometrium.