Prolonged in utero retention and mummification of a Macaca mulatta fetus.

An intrauterine mummified fetus in a Macaca mulatta was delivered surgically 708 days after onset of the last menstrual flow. Supracervical hysterectomy and left salpingo-oophorectomy were done. The fetus consisted of a compressed but complete skeleton and hairy skin adherent to the intact, thin uterine wall. Placenta and umbilical cord could not be identified.