Is tummy tuck with flank liposuction dangerous? Better to do separately? (photos)

Liposuction is unnecessary to create the look you are trying to achieve,and.....its dangerous to combine the procedures.  You seriously need to rethink the current plan.  The literature represents the science.  The people that do these procedures together either do not read the literature, which is inexcusable, or read it and don't care that the danger to the patient is real, which is inexcusable.
In addition, there are technical reasons why both should not be done at the same time.

Abdominoplasty treats the skin excess and muscle weakness of the abdomen, as well as any fat that is between the belly button and the pubic hairline. Liposuction treats only fat. It can be used to thin out the abdomen, but the skin must be in good condition with no excess, and there should not be muscle weakness. I do not like to combine abdominoplasty with liposuction because of the added risks of fluid collection under the skin, blood clots (potentially fatal) and wound healing problems.

Aggressive liposuction with tummy tuck is dangerous.  A full tummy tuck with liposuction at the same time will certainly put you at a high risk for fluid under the tummy tuck skin (seroma). A full tummy tuck with aggressive liposuction at the same time will also certainly put you at an unacceptably high risk for a potentially fatal pulmonary embolism (PE), venous thromboembolic event (VTE). The literature is complete with this information. The science is the science. This is a risky combination.

Study outcomes in the Plastic Surgery Literature (Fluid Collection Risk):

Results: One hundred twenty-five patients underwent abdominoplasty with flank liposuctionand 75 patients underwent abdominoplasty alone. The incidence of seroma formation was 16.0 percent in the abdominoplasty-alone group and 31.2 percent in the abdominoplasty with liposuction group (p < 0.05).

The combination of abdominoplasty and liposuction procedures can still overwhelm the body's ability to resist these shear forces by the fact that more surface area is available to “shear” and thus produce seroma fluid. Not so much as an additive effect but synergistically, such that the seroma fluid from the flanks flows into the adjacent abdominal space and resists the ability of the upper abdominal flap to close over the abdominal wall. Patients must be counseled about their risk for seroma formation and treatments aimed at resolving them including frequent postoperative visits for needle drainage and the rare case requiring operative drainage in the face of a persistent seroma.

In another study (Blood Clot Risk)

Conclusions:

The amount of fat removed during plastic surgery is a factor influencing the occurrence of pulmonary embolism in patients undergoing abdominoplasty/flank liposuction, and the duration of surgery is a concomitant factor.

This combination of liposuction of the flanks and abdominoplasty

All risk no benefit.

See Journal Link below to read the studies yourself.

These two procedures are commonly done together to get a good sculpted result. You might consider getting a couple more consultations with board certified plastic surgeons. Good luck.

I usually do both procedures together. I would ask your doctor his reasoning for this Its hard to give an answer without seeing medical history.If you feel that doctor doesn't do it I would get a second opinion to see why it can't be done.