My Male Friend,yes Really,friend Was Told He Had Endotametrious. Can

My male friend,yes really,friend was told he had endotametrious. Can you explain? He also had 4 polyps removed. (which I've had 3 removed in the past & my brother goes in every couple years & they remove some. But but the other problem I'm not understanding. Maybe he spelt it wrong. Maybe he ment diverticulitis