>Supposedly it scars the pancreas
Shock wave lithotripsy (SWL)
On the downside SWL can cause vascular trauma to the kidney and surrounding organs. This acute SW damage can be severe, can lead to scarring with a permanent loss of functional renal volume, and has been linked to potentially serious long-term adverse effects.
A recent retrospective study linking lithotripsy to the development of diabetes mellitus has further focused attention on the possibility that SWL may lead to life-altering chronic effects
data showing that treating with a progressive increase in SW energy is protective, and that slowing the rate of SW administration can virtually eliminate acute tissue injury, indicates that SWL can be performed safely. As protective treatment protocols begin to be adopted it is hoped that long-term adverse effects will also be reduced, perhaps eliminated entirely.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2900184/