This is a 6-month follow-up case of a patient who underwent 360° thigh liposuction combined with hybrid breast augmentation.

The patient had a BMI under 18 and a naturally slim body type.

For slim patients, common concerns include:

● “Can enough fat be harvested for breast fat grafting?”

● “How much of the injected fat will remain long-term?”

● “Will breast implants look too obvious on a thin frame?”

At AVAN TOKYO, we do not simply focus on removing as much fat as possible or injecting the largest possible volume.

We consider the entire body silhouette, including:

● how much the thighs should be refined,

● how much usable fat can safely be harvested,

● how much breast volume should be created with implants,

● where fat grafting should be used to soften the décolletage and cleavage,

● and how to create a balanced breast contour that looks natural on a slim body.

Why Combine 360° Thigh Liposuction with Hybrid Breast Augmentation?

Hybrid breast augmentation combines breast implants and fat grafting.

The implant provides the main structural volume, while carefully placed fat grafting can help soften transitions around the implant and improve areas such as the upper breast, décolletage, and cleavage.

This approach can be particularly useful for patients with a low BMI.

Slim patients often have thinner subcutaneous tissue and less natural breast tissue. Depending on the anatomy, this may make the outline or edges of an implant more noticeable.

At AVAN TOKYO, implant selection and fat placement are therefore planned according to factors such as:

● chest width,

● breast tissue volume,

● soft tissue thickness,

● skin elasticity,

● desired projection,

● and overall body balance.

When 360° thigh liposuction is performed at the same time, the harvested fat may also be used for breast fat grafting when appropriate.

This allows us to approach the procedure not only as breast enlargement, but as total body contouring.

Why Did Some of the Fat in the Cleavage Area Decrease by 6 Months?

In this patient, some of the fat grafted near the central breast and cleavage area had decreased by the 6-month follow-up.

This does not necessarily indicate an abnormal result.

With breast fat grafting, not all injected fat survives permanently. The transferred fat cells must establish an adequate blood supply in their new location in order to survive.

Fat graft survival is generally considered to stabilize over the first several months, but the final volume can still be influenced by multiple factors, including:

● the injection area,

● the amount of fat injected,

● tissue thickness,

● blood supply,

● weight changes,

● nutritional status,

● smoking,

● and individual healing characteristics.

The cleavage and décolletage areas can be relatively challenging areas for fat grafting because the available tissue space may be limited and the soft tissue layer can be thin.

For this reason, simply injecting a larger amount does not necessarily lead to better retention.

Careful placement in small amounts and multiple tissue planes is important to avoid excessive pressure on the grafted fat.

Does Fat Become Completely Stable After 3 Months?

Patients are often told that transferred fat becomes established at approximately 3 months.

The first few months are certainly an important period for fat graft survival.

However, this does not mean that lifestyle and body weight no longer matter after 3 months.

Once the transferred fat survives, it behaves similarly to normal body fat.

If a patient loses a significant amount of weight, those fat cells can also decrease in size.

This is especially important for patients with a BMI under 18, because even a relatively small decrease in body weight may visibly affect breast volume.

At AVAN TOKYO, we therefore recommend avoiding excessive dieting after breast fat grafting and maintaining a nutritionally balanced diet even after the initial recovery period.

Adequate intake of:

● protein,

● carbohydrates,

● healthy fats,

● vitamins,

● and minerals

is important for general postoperative recovery and long-term weight stability.

What If You Want More Breast Volume After 6 Months?

Hybrid breast augmentation does not always have to be completed in a single procedure.

For slim patients in particular, there may be situations where a staged approach is more appropriate.

After the breasts have stabilized, some patients may feel:

“I would like slightly more cleavage.”

“I want a little more fullness in the upper breast.”

“I want the implant contour to look even softer.”

In these situations, a second round of fat grafting may be one option.

Rather than placing an excessive amount of fat during the first procedure, it may sometimes be preferable to evaluate the final result and add additional fat later if necessary.

At AVAN TOKYO, we assess the breasts during postoperative follow-up, including around 1 month, 3 months, and 6 months.

We evaluate:

● the remaining fat volume,

● breast shape,

● symmetry,

● implant position,

● soft tissue coverage,

● and the patient’s desired final volume.

We can then determine whether additional treatment would be appropriate.

For Slim Patients, Fat Placement Matters More Than Fat Volume Alone

Patients with a BMI under 18 often have limited donor fat.

For this reason, we believe the question should not simply be:

“How many cc of fat can be injected?”

A more important question is:

“Where should the limited amount of fat be used most effectively?”

Rather than using fat in areas where the implant already provides sufficient volume, it may be more useful to place it strategically in areas such as:

● the décolletage,

● cleavage,

● upper breast,

● implant edges,

● or areas with thinner soft tissue coverage.

Even relatively small differences in fat placement can influence how the breast looks from the front, side, and three-quarter view.

Designing the Thighs and Breasts as One Body Line

The purpose of combining thigh liposuction with hybrid breast augmentation is not simply to “move fat from the thighs to the breasts.”

The thighs themselves must also be carefully designed.

With 360° thigh liposuction, areas such as the:

● inner thighs,

● outer thighs,

● anterior thighs,

● posterior thighs,

● and areas around the knees

must be evaluated as part of one continuous leg contour.

At the same time, breast augmentation should be planned according to the waist, rib cage, shoulders, and overall upper-body proportions.

The goal is not simply to make the breasts larger.

It is to create stronger contrast between the lower body, waist, and bust while maintaining proportions that suit the individual patient.

AVAN TOKYO’s Approach to Hybrid Breast Augmentation

Hybrid breast augmentation is not determined by implant size alone.

The final result depends on many anatomical factors, including:

● rib cage shape,

● chest width,

● breast tissue volume,

● skin thickness,

● décolletage volume,

● donor fat availability,

● implant profile,

● and fat graft placement.

For slim patients, even a relatively small amount of strategically placed fat can significantly change the appearance of the cleavage and upper breast.

At AVAN TOKYO, liposuction and breast augmentation are not planned as completely separate procedures.

We design them together as part of full-body contouring.

Hybrid breast augmentation may be worth considering for patients who:

● want slimmer thighs and fuller breasts,

● are too lean to achieve their desired volume with fat grafting alone,

● are interested in implants but want softer contours,

● want more fullness in the décolletage or cleavage,

● or want to improve both lower-body and upper-body proportions in one treatment plan.

Frequently Asked Questions

Can patients with a BMI under 18 undergo hybrid breast augmentation?

In some cases, yes.

However, the amount of available donor fat varies from patient to patient. We assess possible donor areas such as the thighs, arms, abdomen, waist, and back before determining whether fat grafting alone, implants alone, or hybrid breast augmentation is the most appropriate option.

Can breast volume still decrease 6 months after fat grafting?

The breasts normally become smaller compared with the immediate postoperative period as swelling resolves and non-surviving fat is absorbed.

After the transferred fat has survived, future weight loss may also reduce the size of the fat cells and therefore decrease breast volume.

Is fat grafting more difficult in the cleavage and décolletage?

These areas may have relatively thin tissue and limited space for fat placement.

For this reason, the amount that can be safely injected at one time may be limited, and fat retention can vary from patient to patient.

Can I have a second fat grafting procedure?

Yes, additional fat grafting may be considered after the result of the first procedure has stabilized.

The appropriate timing depends on the condition of the breast tissue, implant position, remaining fat volume, donor fat availability, and the patient’s goals.

Can 360° thigh liposuction and hybrid breast augmentation be performed at the same time?

They can be combined in selected patients.

Because the total surgical area becomes larger, preoperative blood tests, estimated liposuction volume, anesthesia planning, and postoperative management are particularly important.

Summary: Hybrid Breast Augmentation Should Be Evaluated Beyond the First 3 Months

Breast fat grafting is not complete at the moment the fat is injected.

Over the following months, swelling decreases, transferred fat either survives or is absorbed, and the final breast contour gradually becomes clearer.

In slim patients, especially those with a BMI under 18, some reduction in volume may become noticeable in areas such as the cleavage or décolletage.

The important point is to evaluate the breasts after sufficient healing and decide:

● whether the current volume is satisfactory,

● whether additional fat grafting would be beneficial,

● and which specific areas should be treated.

At AVAN TOKYO, we follow patients beyond the initial recovery period and evaluate the relationship between liposuction results, implant position, fat graft retention, and overall body proportions.

For patients considering 360° thigh liposuction and hybrid breast augmentation in Tokyo, or for slim patients who are unsure which breast augmentation method is suitable for their body type, an individualized consultation can help determine the most appropriate treatment plan.

Results and fat graft survival vary between individuals.

Possible Risks and Complications

Possible risks include infection, bleeding, hematoma, asymmetry, fat necrosis, lumps, calcification, contour irregularities, skin retraction, scars, implant displacement, capsular contracture, and other complications.