Infertility associated with persistent hymen in an alpaca and a llama. The Canadian veterinary journal. La revue vétérinaire canadienne [Can Vet J] Journal article

Perforation and dilation of the persistent hymen in an alpaca and a llama, detected by vaginal examination and endoscopy, was achieved by use of a sigmoidoscope and incremental dilation using cylindrical instruments to a maximum diameter of 38 mm. Outcome and subsequent fertility are dependent on length of time the obstruction has been present and secondary uterine disease.

The Canadian veterinary journal. La revue vétérinaire canadienne [Can Vet J]