<prompt> True about endometriosis isare :Most common in 3rd or 4th decadePremenstrual spotting absentEndometrial sarcoma is most commonTrue cyst  <response>: Most common age group is between 30-45years Abnormal menstruation seen in 20 Menorrhagia is seen If the ovaries are also involved polymenorrhea, epimenorrhagia may be pronounced May be premenstrual spotting seen Malignancy is rare, commonest being adenocarcinoma Reference: D.C.DUTTAS TEXTBOOKOF GYNECOLOGY; 6th edition; Page no: 306 