Quantifying Breast Asymmetry Before and After Equal-Volume Subfascial Augmentation: the Volume-Shape Paradox

Area of Science:

• Plastic Surgery
• Aesthetic Surgery
• Breast Augmentation

Background:

• Breast asymmetry is common, yet evidence for surgical correction is limited.
• Understanding the limits of bilateral augmentation with equal implants is crucial for patient counseling.
• The Volume-Shape Paradox explains discrepancies between volume and shape correction.

Purpose of the Study:

• To measure breast asymmetry before and after equal-volume subfascial augmentation.
• To propose the Volume-Shape Paradox to explain correction limitations.
• To identify reliable predictors of postoperative symmetry.

Main Methods:

• 166 patients undergoing primary subfascial breast augmentation.
• Ten anthropometric measurements recorded pre- and post-surgery (3 months).
• Breast volumes estimated using the BREAST-V formula; volumetric and linear asymmetry assessed.

Main Results:

• Mean volumetric asymmetry decreased from 13.6% to 8.1% (p < 0.001).
• Linear shape measurements remained largely unchanged; inframammary crease asymmetry worsened.
• Sternal notch-to-nipple distance effectively predicted volumetric asymmetry.

Conclusions:

• Equal-volume augmentation improves volume but not shape asymmetry.
• The Volume-Shape Paradox highlights constraints in correcting asymmetry.
• Sternal notch-to-nipple distance is the most informative preoperative measurement for counseling.