Identify the correct statements from the below about "Renal calculi".
(I) Renal calculi, also called renal stone or kidney stone or nephrolithiasis.
(II) It is mainly due to the accumulation of soluble crystals of salts of sodium oxalates and certain phosphates.
(III) This result in severe pain called "renal colic pain" and can cause scars in the kidneys.
(IV) Renal stones can be removed by techniques like pyleothotomy or lithotripsy.

Explanation

pyleothotomy