It can be diagnosed by rectal palpation: a hard mass approximately the size of a rabbit is felt in the uterus, adhered to the uterine wall due to the absence of amniotic and allantoic fluid.
Generally, it is not expelled due to the presence of a persistent corpus luteum, so it is necessary to administer prostaglandins to induce evacuation.
In some cases, the mummified fetus can be found retained in the vagina, in which case it is manually removed.
