Endometrosis (from greek ἔνδον = endos (inside), ancient greek μέτρα= metra (womb) und ancient greek ωσις = -osis (disease)) is a chronic-degenerative disease of the endometrium in domestic species that is clinically and economically important because of limits in fertility. Endometrosis can be confirmed only by histological examination after endometrial biopsy.
The disease may occur in female pets of all ages but is more frequently in older age. The causes and pathogenesis of endometrosis are widely unknown. Affected horses tend to miscarriages, underdeveloped foal and metritis.
The changes in the endometrium are widely irreversible. An effective treatment is not known.
There is no relationship between endometrosis and the human disease endometriosis.