Purpose: Accurate measurement of the differences in volume between breasts is extremely important. To enable surgeons to base their estimation on an objective evaluation, we have developed a simple method based on an inflatable mammary prosthesis.

Patient and Methods: In our method we used a round expander and a commercial mammometer developed by Tegtmeier. The round expander was placed around asymmetrical and symmetrical breasts, through the suprapectoral or subpectoral method. The round expander was filled with saline to the level of normal breast volume. The volume of the saline used was measured and added to the expander tare. The total volume of the expander tare and the measured saline shows the difference in volume between the two breasts. We have used our method on 4 cases of asymmetrical and 10 cases of symmetrical breasts.

Conclusion: This method allows the measurement of the volume differences of asymmetric breasts and also helps the surgeon to estimate the size of prosthesis to be used in augmentation mammoplasty.