Beach has seen a twin compound pregnancy in which after connection there was a miscarriage in six weeks, and four years after delivery of an extrauterine fetus through the abdominal walls.

Cooke cites an example of intrauterine and extrauterine pregnancy progressing simultaneously to full period of gestation, with resultant death.
Rosset reports the case of a woman of twenty-seven, who menstruated last in November, 1878, and on August 5, 1879, was delivered of a well-developed dead female child weighing seven pounds.

The uterine contractions were feeble, and the attached placenta was removed only with difficulty; there was considerable hemorrhage.

The hemorrhage continued to occur at intervals of two weeks, and an extrauterine tumor remained.

Two weeks later septicemia supervened and life was despaired of.