What's happening after mastectomy?

[Moni]

We are debating currently whether she should get radiation in general since thank goodness only one lymph node (so far... we are still waiting for the full results!) was effected. Her doc mentioned no radiation necessary, the oncologist and breast surgeon that was initially scheduled for her surgery mentioned radiation after chemotherapy and mastectomy - no matter what).

I told her to get her doc's opinion tomorrow and if he doesn't think it's necessary, still get a second or a third opinion - just to be on the safe side.
Do any of you have experience with this or wish they would have done radiation when they said it's not necessary?

Thanks so much,
Moni