I have had the lump for 3 yrs & I can no longer live with the pain. It gets worse every month. I have seen Dr after Dr but they are dismissive & not concerned. My OB thinks its just scar tissue, but I have read about Endometriosis which fits my symptoms best. My Dr. doesn't think its endo because my ultra-sound revealed nothing. Which from what I have read it says you rarely see endo in ultrasound. Is there a possibility it is Scar tissue or something other then Endometriosis?