our oncologist told us the old way of thinking was if they 'got it all' you didn't need chemo and now they are 'smarter' and realize post op chemo is recommended no matter what...the length of time may just differ...but you want to make sure you catch and 'stray' or 'wondering' cancer cells. i'd get another opinion, i'd ask for an mri, a ct, a pet...anything to clear out any doubt. this is your mom's life and yours...worry shouldn't eat at you....don't stop until you are satisfied. remember, you'll never regret pursuing - just don't kick yourself that you didn't. peace to you both.