Because of this, endometriomas tend to bleed within the cyst cavity during menstruation, and over time, they fill up with old, dark blood and shed tissue - hence why they're sometimes also called " chocolate cysts" .

因此，在经期内，它的囊腔内可能会出血；久之囊内就充满了陈旧、暗黑色的血和脱落组织，这也是它们又被称为巧克力囊肿的原因。