Implant Size — The Truth Behind "How Many cc Should I Get?"
Dr. Nam Jeong-Hyun · Director, Umnagumo Plastic Surgery
Almost every consultation begins with the same question: 'how many cc should I get?' It is the wrong question — not because cc does not matter, but because cc is the answer, not the question. The right input is the patient's chest wall, breast base width, soft-tissue cover, and lifestyle. The cc number falls out of those inputs; it cannot be chosen in front of them.
This column explains what the surgeon is actually measuring and weighing when arriving at a recommendation, and why two patients who both "want 300 cc" can end up with very different recommendations.
Base width comes first
Base width is the horizontal distance between the medial and lateral edges of the breast — the geometric footprint of the implant pocket. Choose an implant wider than the base width and the implant will overlap the sternum medially or push laterally toward the armpit. Choose one narrower and the implant edge will be visible against the chest wall.
Most slim Asian patients have a base width in the 11–13 cm range. That dictates the family of implants we can responsibly select from before any cc number enters the conversation.
Soft-tissue cover decides what the patient can hide
Pinch test at the upper pole tells us how thick the soft-tissue cover is. A patient with 2 cm of pinch can carry an implant that a 1.2 cm patient cannot — the same implant in the second patient will show its upper edge and likely ripple.
When the cover is thin, the right answer is sometimes a smaller implant in a more covered plane (subfascial or dual plane), not a larger implant in the same plane. The cc number is the consequence of that decision.
Profile — the projection-to-base ratio
A given cc volume can be packaged into a low-, moderate-, or high-projection implant. Higher projection on a narrow base width gives more forward push from the same volume; lower projection on a wider base gives more spread.
The right profile is decided by the look the patient wants and the soft-tissue thickness available to disguise the upper pole. Choosing a profile for cosmetic reasons alone, without regard to the base width or cover, is one of the most common upstream causes of revision.
Lifestyle quietly sets the upper bound
A patient who runs marathons, swims competitively, or trains the chest seriously will find that an implant sized purely for aesthetic ambition becomes a daily friction point. The lifestyle factor is the conversation about long-term comfort, exercise tolerance, and the rate of revision over a 20-year horizon.
The recommendation often ends up smaller than what the patient walked in wanting — and this is usually the recommendation the patient is glad they followed five years later.
How the cc number is finally chosen
Once the base width has determined the implant family, the soft-tissue cover has determined the plane, and the profile has been matched to the look and the cover, the cc number is the variable that's left. The 'right cc' is the cc that simultaneously:
- •Fits within the base width with no medial overlap or lateral drift.
- •Is covered enough by the chosen plane and the available soft tissue.
- •Delivers the projection the patient wants without forcing the wrong profile.
- •Is comfortable for the patient’s lifestyle over a 10–20 year horizon.
The cc number is a real decision — but it is the last decision, not the first. A consultation that opens and closes on cc has skipped the actual planning. A consultation that has covered base width, cover, plane, and profile, and arrives at a cc number you trust, is the conversation that produces a breast you still trust ten years later.
— Dr. Nam Jeong-Hyun, Director