A tubal pregnancy in a rhesus monkey (Macaca mulatta).

Tubal pregnancy was diagnosed on histological section of a nodule within the uterine tube of a multiparous rhesus monkey. Clinical signs were anorexia and weight loss. The tube contained a placenta of approximately 35 days gestation, but no recognizable embryo or amnion. The ipsilateral ovary contained a degenerating corpus luteum.