When do you recommend prone breast radiation?

If the plan is for whole breast radiotherapy without nodal treatment, I treat almost all women prone. The only women that are treated supine are those that have lump cavities that preclude the benefit of a prone plan (positioned posteriorly along chest wall, so tangents cut through lung/heart) or th...

I treat at prone for whom I plan to treat whole breast, with no intention to cover low axilla or ipsilateral IMN. If breast hang adequately ( usually cup breast size large B & above) , I prefer prone position for dose homogeneity, less lung ( if any at all) and rib exposure.