Intravascular Adenomyosis in a Cynomolgus Macaque (Macaca Fascicularis).

Intravascular adenomyosis was discovered in a cynomolgus macaque, a previously unreported presentation of adenomyosis in non-human primates that points to vascular involvement in adenomyosis etiology. Uterus gross exam was unremarkable, but histologic examination revealed multifocal endometrial tissue intimately associated with large thin-walled myometrial vessels and surrounded by CD31 immunopositive endothelium.