Abdominal pregnancy in a golden hamster (Mesocricetus auratus).

Ten days following the birth of five apparently normal pups, a female hamster developed bilateral abdominal distention. Both dam and pups appeared healthy at this time. The dam was killed, and postmortem examination revealed five additional pups encapsulated in the abdominal cavity outside the uterus. It was not possible to determine if this was a primary ectopic implantation or occurred secondary to the recent partuition.