1. In vitro fertilization outcome relative to embryo transfer difficulty: a novel approach to the forbidding cervix 
Nicole Noyes, M.D., Frederick Licciardi, M.D., James Grifo, M.D., Ph.D., Lewis Krey, Ph.D., Alan Berkeley, M.D. 
Fertility and Sterility 
Volume 72, Issue 2, Pages (August 1999)
DOI: /S (99)

2. Figure 1 Projecting ridge (arrow) of tissue in cervical canal.
Fertil Steril ©1999
Fertility and Sterility  , DOI: ( /S (99) )

3. Figure 2
Relatively obstructive posterior internal os tissue (two shorter arrows) in cervical passage of an acutely anteverted uterus. Note old perforation site (longer arrow) below obstructing ridge.
Fertil Steril ©1999
Fertility and Sterility  , DOI: ( /S (99) )

4. Figure 3
Posterior cervical canal during shaving of obstructing tissue. The perforation site (arrow) was subsequently cauterized closed.
Fertil Steril ©1999
Fertility and Sterility  , DOI: ( /S (99) )