However, these excellent results were short-lived. The polyurethane dissolved in the body. The underlying shell was thin, and it couldn’t hold the gel in a specified shape. The gel was too soft and too non-form stable. Gravity called the gel to fall to the bottom of the shell. It lost vertical height and so the upper breast became underfilled and concave. The lower breast became relatively overfilled. The initial shape became lost. Folds inevitably occurred from the collapse as can be seen in the picture. Just like a folded newspaper in a drawer becomes weak along longstanding folds, so too does a breast implant shell weaken along folds. So the shell went on to have a high rupture rate. The relatively non-cohesive gel would then leak out and migrate. This could stimulate an inflammatory reaction around the implant, and the normally thin and soft scar tissue around the implant became thicker and harder (capsular contracture). Before long, the initial great result would often be lost.