I have had much experience in fat grafting to the buttocks for Brazillian Buttock Augmentation in Los Angeles. I have had patients from 105 lbs to more than 200 lbs. the best results were in those that had much fat available for harvesting. In my experience depending on the technique of harvesting, processing, and injecting the fat, at least 90% of the volume can stay. I have had several patients who have retained more than 90% of their buttock volume despite having had pregnacies, working out, and after more than 5 years.
Breast reconstruction may be performed after mastectomy, to rebuild injured or congenitally deformed breasts, or as part of gender reassignment surgery. As part of the reconstruction process, a breast tissue expander may be used to stretch the patient's tissue for insertion of an implant or the patient's own tissue. Tissue expanders are like thick-walled silicone balloons, come in different sizes and shapes, and may have a smooth or textured outer surface. They are implanted under the breast skin, tissue, or chest muscle, and are regulated by the FDA as medical devices. In immediate reconstruction, the expander is inserted immediately following mastectomy. For patients who choose delayed reconstruction, the expander is implanted in a separate surgery months or years later.
They are essentially very similar procedures. The difference is in the amount of breast tissue removed. In a breast lift procedure, the nipple areolar complex is lift to a better position on the breast, and some breast tissue is removed and the breast envelope tightened. In a breast reduction, the nipple areolar complex is also lifted, but much more breast tissue is removed. 
Unfortunately, as time goes on it is often difficult for patients to remember the specifics of the type of breast augmentation surgery and implants that they had.  Your are not alone!  The easiest way to determine what type of implant you had is to request a copy of the operative report from either the hospital, surgery center or your surgeon's office.  The implant specifics are recorded on this document.  Your office record also includes this information.  If it has been over ten years since your procedure, sometimes these records are no longer available.  Ultrasound or MRI can help to answer this question but it is an expensive way to solve the mystery and not an indication for these procedures.  If you registered your implants with the manufacturer at the time of surgery, the company will have a record of this information.  Fortunately, this inforation is not absoltely critical to your health unless you are having a problem with your implants.  Your surgeon can often develop a reasonable treatment plan even without this information.  I would strongly recommend that you register your implants and purchase the affordable insurance program if you have surgery again.  These programs are helpful in storing vital information regarding your implant type, size, filler, model and lot number.  Should there be a recall or long term problem requiring additional surgery, this information is readily available.  There is often also some fiancial support to offset costs.  Investigate the options available by contacting your surgeon or the implant manufacturer's websites.
Fat Transfer for a Natural Breast Augmentation will use the fat from another area on your body to create a modestly larger breast size. This can be used at the same time as fat grafting to reshape the breasts, as well as a breast lift. Many women choose to go with the fat transfer because they are not introducing any foreign substance to their body.
They are essentially very similar procedures. The difference is in the amount of breast tissue removed. In a breast lift procedure, the nipple areolar complex is lift to a better position on the breast, and some breast tissue is removed and the breast envelope tightened. In a breast reduction, the nipple areolar complex is also lifted, but much more breast tissue is removed. 
Your primary augmentation is not the only cost you need to factor in when you are asking how much do breast implants cost. Women with silicone gel breast implants must factor in long term maintenance costs. Silicone gel breast implants can have “silent ruptures,” where an implant ruptures without showing any symptoms. The FDA recommends women with silicone gel implants get an MRI scan three years after getting their implants, then every two years for the life of the implant to detect silent ruptures. If a silicone gel implant ruptures, you will need surgery to remove the implant shell and any leaked silicone gel. It is important to remove implants that have ruptured because the silicone gel may begin to leak outside of the capsule and cause painful symptoms. The FDA lists a few of these symptoms as, “a decrease in breast size, change in breast implant shape, hard lumps over the implant or chest area, an uneven appearance of the breasts, pain or tenderness, tingling, swelling, numbness, burning, or changes in sensation.” However, because of the out-of-pocket cost of MRIs, many women skip their recommended MRI scans. According to Business Insider the average cost of an MRI is $444 to $1468. That means if a woman with silicone gel breast implants keeps up with the recommended MRIs she will pay on average $3,108 to $10,276 just for MRIs if her implants stay intact for 20 years. That puts the total cost of silicone gel breast implants closer to $10,000-$20,000 over 20 years, and even more if a revision surgery is needed. 

Inframammary: an incision made to the inframammary fold (natural crease under your breast), which affords maximal access for precise dissection of the tissues and emplacement of the breast implants. It is the preferred surgical technique for emplacing silicone-gel implants, because it better exposes the breast tissue–pectoralis muscle interface; yet, IMF implantation can produce thicker, slightly more visible surgical scars.
2. You buttock's structural anatomy is also an important factor.  A V-shaped buttock typically requires more fat transfer to achieve a satisfactory improvement than an A-shaped buttock.  Transferred fat cells need to grow their own blood supply from the surrounding buttock tissues in order to survive.  In order for this to happen, the transferred fat cells need to be gently interwoven between your buttocks' living cells to survive.  Therefore, each person's buttocks can only receive a certain amount of fat, and exceeding that amount will not be effective.  A generous amount of fat is typically transferred at the time of surgery, knowing that some of the fat will go away during the recovery period.
The good news is that both types of implants are considered safe. The Food and Drug Administration (FDA) removed silicone implants from the consumer market in 1992 as a precautionary measure after conflicting reports of possible complications surfaced. Some of these complications required breast implant removal. However, silicone gel-filled breast implants were fully exonerated and reapproved in 2006. (Read more about implants and the FDA.)

There are two types of breast implants approved by the Food and Drug Administration (FDA): silicone-filled and saline-filled. They come in various sizes and shapes, and with two types of shells: textured shells and smooth shells. A type of silicone-filled implant with a thicker filling, called a form-stable highly cohesive implant, or "gummy bear" breast implant, is currently under investigation and may one day provide another option for women undergoing breast augmentation with implants.

Case 78: A combination approach was used here to create a really meaningful but completely natural transformation. Otoplasty made prominent ears all but disappear from the field of view and no longer distract or draw attention. At the same time, rhinoplasty, chin augmentation, and neck liposuction accomplished were able to remove a nasal hump and overprojection while improving chin and neck laxity to achieve a nice overall balance.
A breast reduction with lift surgery combines two procedures to improve the size and shape of the breasts. A reduction involves decreasing the size of overly large breasts by removing excess tissue and skin. A breast lift is done in order to raise and reshape the breasts. The breast reduction and lift procedure helps to alleviate problems caused by overly large, sagging breasts, including:
The amount of good quality, transferrable fat will depend on how much can be retrieved from the donor sites. This can be partially estimated after examination (the surgeon inspects and pinches the areas of potential fat harvest to get an idea of how much fat can realistically be harvested), but it is hard to know for sure until the procedure is well underway. Abdominal and love handle/flank fat tend to be the best sources because the fat is more easily retrieved and softer than back fat, but the back is also routinely liposuctioned in the BBL procedure to both obtain extra tissue for transfer and to improve the 360 degree shaping of the torso. I have transferred anywhere from 300cc per buttock to over 1200 in some patients, depending on the circumstances.
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