Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).
Even though 85 percent of kidney stones are small enough to pass during urination, fewer than 50 percent of patients chose this option. A person with a normal-size ureter can usually pass a kidney stone with a diameter less than 5 mm (about 3/16 of an inch) without significant pain or risk of kidney damage.
Treating kidney stones. Most kidney stones will be small enough (no more than 4mm or 0.2in in diameter) to be passed out in your urine. It may be possible to treat these at home. However, small kidney stones may still cause pain.The pain from smaller kidney stones usually lasts a couple of days and disappears when the stone has been passed.ost kidney stones will be small enough (no more than 4mm or 0.2in in diameter) to be passed out in your urine. It may be possible to treat these at home. However, small kidney stones may still cause pain.