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.
How Long Will Your Kidney Stone Take To Pass? If you have the symptoms of a kidney stone, head to your doctorâs office. They will be able to tell you the approximate size of the stone. Then you both can discuss treatment options. Maybe they are confident it can pass on itâs own. You will go home with pain medication to help you through that process.