This hair loss question was answered by Dr. Arthur Tykocinski of São Paulo, Brazil who is a member of the Coalition of Independent Hair Restoration Physicians
Is surgical hair restoration an option for a young man with a balding crown?
I believe it could be done when the hair loss pattern is already defined and when saving donor hair for the future, if needed. I avoid performing two sessions just on the crown. During the second hair transplant I will add hair at least to the top/tuft area and check if there is still good donor supply to address future hair loss.
If the crown is too big, I definitely would avoid starting hair transplants on it because we would rapidly deplete the donor bank and sometimes not even finish that area.
David (TakingThePlunge) Forum Co-Moderator and Editorial Assistant for the Hair Restoration Forum and Social Network, the Coalition Hair Loss Learning Center, and the Hair Loss Q & A Blog.