The aim of this paper is to introduce a computer program developed to provide objective, quantitative data useful to ensure proper expander selection when having to use a rectangular tissue expander. The program is developed to calculate the volume of a rectangular tissue expander to obtain the exact amount of yield needed to allow for reconstruction of a determined defect. The only data to be supplied are the length and the width of the defect to be reconstructed. In our opinion, although its use is not aimed at replacing clinical judgment based on experience and careful observation, this program may be considered a simple and useful adjunct for the inexperienced surgeon (or the occasional operator) planning to use a rectangular tissue expander.
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