Spontaneous Atypical Meningioma in a Pregnant Rhesus Macaque (Macaca mulatta).

Spontaneous meningiomas are rarely reported in nonhuman primates, and among the documented cases, only a few are thoroughly characterized. This report describes a case of atypical meningioma in a pregnant rhesus macaque (Macaca mulatta) that exhibits pathobiological features that mirror humans.