Is a plastic crinkle sound normal with an breast expander, the sound being internal?

If the expander is not completely filled you may feel a crunching type sound.  Should not be a problem, Check with your plastic surgeon. 

Thanks for writing, With tissue expanders the idea is to stretch the skin and eventually allow room for the permanent reconstruction: either a flap or an implant, which is usually silicone. As the tissue relaxes and stretches the expander softens and the crinkling can be the bag inside. This typically is not a problem, as a matter of fact this is something we see periodically with normal saline breast implants for augmentation.  I would let your Plastic Surgeon be aware of this. Relative to the hardness around your expanders, again this is something your Plastic Surgeon can answer for you. Good LuckStephen M. Davis, MD, FACSGreen Hills Plastic Surgery