Liposuction is not done in the central upper abdomen at the time of a tummy tuck by many plastic surgeons in an effort to a avoid wound healing complications. While it may be viewed as a 'homerun' effort and offers more complete abdominal contouring, should a necrotic skin flap develop below the belly button (no matter how small) it will make you wish it had been omitted from the procedure. It is much better to have a tummy tuck that heals well. You can always undergo a secondary upper abdominal liposuction procedure later which is a much more tolerable 'problem' than to go through the time and tremendous inconvenience of a long healing process of an open wound...not to mention the ugly scar which will result.
Web reference: http://www.eppleytummytuck.com/