Is it possible to have liposuction incisions for flanks only in the back?

Yes it's possible to do the flank liposuction from the back only in my experience, I usually use two small incisions on each side.

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  I have performed flank contouring liposuction with small back incisions only.  It can work very well for the right patient.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon