Yes adenomatous is pre cancerous. Idk why you are so freaked out. Polyps are very common. Be thankful you dont have cancer like I do!!!!! Only biopsy tells if it is cancer or not. The naked eye can not say 100%. If thwts what you are looking for someone to tell you, no one can. Not even the doctor. Mine was 4 cm... FOUR TIMES AS BIG AS YOURS AND GUESS WHAT, IT WAS NOT CANCER. Idk if my child will have his mother growing up because I do have cancer and I am not obsessing over it like you are. You reqlly need to see a therapist before it takes a toll on your children.