What is nephritic colic crisis caused by lithiasis?

80% of renal colics are caused by stones in adults, acute lumbo-abdominal pain from severe tension of excretory tract of UUT upstream of an obstruction. Pressure increase is due to (edema generated in contact w/calculus promoting retention of overlying urine and block of calculus passage, or due to stimulation of vasodilator E2 PGs due to intracavitary hyperpressure)