Breast augmentation

Choosing implant size: what actually determines what looks right

Patients often arrive at a consultation asking for a specific cup size, but cup sizes are not a standardised unit of measurement, a C cup from one bra brand can differ in actual volume from a C cup in another, and the same cup letter looks completely different on a narrow frame than on a wide one. Surgeons instead size implants in cubic centimetres against measurements taken directly from the patient: chest wall width, the width of the existing breast base, the distance between the breast fold and the nipple, skin elasticity, and how much native breast tissue is already present.

The reason the same volume can look so different between two patients comes down to this base geometry. A 300cc implant on a narrow chest with a tight breast base projects forward noticeably, because the volume has nowhere to go but out. The same 300cc implant on a wider chest with more existing tissue spreads across a larger base and sits lower and flatter, reading as a much smaller augmentation.

Many clinics use rice- or gel-filled sizers worn inside a bra during the consultation, or 3D imaging software that overlays a simulated result at different volumes and profiles. Both are useful for giving a patient and surgeon a shared reference point, but neither is a guarantee: sizers sit externally rather than in the actual implant pocket, and simulation software predicts an approximate outcome from a static image rather than modelling how skin elasticity and the "drop and fluff" process will change the result. The final decision in theatre still rests on intraoperative judgement, trial sizers placed in the actual pocket, checked standing up and from multiple angles.

What this means practically is that the most reliable way to communicate a goal is with reference photographs of breasts on a body shape similar to the patient's own, discussed alongside the surgeon's measurements, rather than a cup-size number alone.

Breastfeeding, mammograms and long-term monitoring after implants

Most patients with breast implants can breastfeed successfully, and the implant itself, whether placed above or below the muscle, does not block milk production. What matters more is the incision used to place it. An incision around the areola carries a small risk of cutting through milk ducts or the nerves that trigger let-down, so a fold or armpit incision is generally preferred for patients who expect to breastfeed in future.

Implants change how a mammogram is read rather than making it impossible. The implant itself is radio-opaque and can obscure breast tissue directly behind it on a standard view, so an accredited mammography unit will take additional "implant-displacement" views that push the implant back and pull the breast tissue forward to be imaged separately. Patients should tell the radiology team they have implants before the scan.

For silicone implants specifically, most national regulators recommend periodic imaging to check for a "silent" rupture, a tear in the shell that leaks gel into the surrounding capsule without obvious symptoms, unlike a saline rupture, which deflates visibly within days. Guidance generally calls for an ultrasound or MRI a few years after surgery and at intervals afterward, continuing for as long as the implants remain in place.

Patients should also know the specific symptoms of BIA-ALCL: new swelling, pain, a palpable lump, or visible asymmetry developing suddenly, typically years after the original surgery, usually caused by a build-up of fluid around the implant. This is assessed with ultrasound and, if fluid is present, by sending a sample for cytology. The condition is rare and has a good prognosis when caught and treated at an early stage.

How do surgeons decide whether implants alone are the right operation?

Before any implant is chosen, a surgeon first asks what is actually causing the concern. Small breasts, breasts that have lost volume, breasts that sit low, and breasts that differ noticeably in size or shape can look similar to the patient, yet they call for different operations. A careful assessment is mostly observation and measurement, and it is done with you standing, because gravity shows what a lying-down examination hides.

Nipple and fold position. Surgeons note where the nipple sits relative to the breast fold. If the nipple already points downwards or lies at or below the fold, an implant alone tends to fill the upper breast while the loose skin and tissue slide lower, which can exaggerate the sagging. In that situation the surgeon may discuss a lift, either together with an implant or on its own. Whether a lift is done in the same operation or in a separate one is a judgement that depends on how much sagging there is and how thin the tissue is. Either way, the decision starts with position, not with volume, and a surgeon who skips this step is not assessing you fully.

Skin quality. Thin, stretched or heavily marked skin, which is common after pregnancy or large weight changes, has less ability to hold an implant's weight. Surgeons usually judge this by gently pinching and stretching the skin and by looking at how it recoils. Poor elasticity often points towards a smaller or lighter implant, because a larger one can stretch the tissue further over the years.

Tissue coverage. The thickness of tissue over the upper chest influences how visible an implant edge will be. Slim patients with little natural coverage have fewer options, and the surgeon may explain that a very large increase is likely to look and feel more noticeable than a modest one.

Chest wall and asymmetry. Almost everyone has some natural difference between the two sides, and many people also have a slightly uneven rib cage or a curve of the spine that makes the breasts look different. An implant cannot correct the chest wall beneath it. A good surgeon points out these differences before surgery, explains which can be softened by using different implant volumes on each side, and which will remain.

General health and wellbeing. Surgeons also consider medical history, medication, smoking, planned pregnancies, and family history of breast disease. Most responsible practices also ask why you want the operation and whether the wish comes from you rather than from pressure or comparison with images online. Some will suggest waiting, or a conversation with another professional, if expectations seem very different from what surgery can achieve.

Two outcomes of this assessment are worth knowing about. First, a surgeon may advise against surgery or advise a different operation, which is a sign of careful practice rather than reluctance. Second, you should leave the consultation able to say in your own words what the surgeon found, what they recommend, what they do not recommend and why. If the explanation stays vague, or you are shown only one option, consider asking for a second opinion before committing.

What should I bring to a consultation, and how do I read before-and-after photographs honestly?

A consultation works best when both sides are prepared. The aim is that you and the surgeon picture the same result and understand the same limits, long before anyone books a date.

What to bring and have ready

• A complete list of your medications, supplements and allergies, including previous reactions to anaesthesia or adhesives.
• Your medical history, including any breast lumps, biopsies, previous breast surgery, and a family history of breast or ovarian cancer.
• The date and result of your last breast imaging, if you have had any.
• Three or four photographs of results you like, and ideally one or two you dislike. Dislikes are often more informative, because they show what to avoid.
• Your questions, written down. Consultations move quickly and it is easy to forget the most important ones.
• A note of your weight history and any plans for pregnancy or major weight change.

When you cannot attend in person, a remote consultation can cover history and goals. It cannot replace a physical examination, so ask how and when you will be examined before the day of surgery, and what happens if the surgeon finds on arrival that the plan should change.

Reading before-and-after photographs

Photographs are among the most persuasive things a clinic can show, and also among the easiest to present unfairly. Look at them as a sceptical editor would.

• Consistent conditions. The same lighting, camera distance, angle, pose and background should appear before and after. Slightly different lighting or posture can change how full a breast looks.
• Timing. Ask how long after surgery each image was taken. Photographs from a few weeks after the operation show swelling and a high implant position, not the settled result. Images taken after six months or more are more representative.
• Similar bodies. Look for patients whose chest width, starting breast size and skin quality resemble yours. A result on a very different body tells you little about your own.
• Variety. A page showing only the very best results is a selection. Ask whether the images are consecutive patients or chosen examples, and whether any complications or revisions are shown.
• The surgeon's own work. Confirm that the photographs show patients operated on by the surgeon who will operate on you, not images supplied by a manufacturer, a different clinic or a stock library.
• Editing. Heavy retouching, filters or changes in makeup, tan or hair can all alter the apparent outcome.

A surgeon who is comfortable with scrutiny will usually welcome these questions. Be cautious about any practice that cannot tell you when the pictures were taken, or that hesitates to show results at one year, including the scars.