A Müllerian duct remnant in an aged male talapoin monkey.

A pelvic mass in an aged, male talapoin monkey, believed to be of Müllerian duct origin, is described. Histologically, the mass was composed of smooth muscle cells and glandular epithelium, although the typical uterine organization of these tissues was not observed. The remainder of the genital system was that of a normal male primate.