hi ! renal calculi are common kidney troubles now a days many of them are facing due to varied reasons. cancer is one of the monstrous disease that is affecting every human irrespective of age and gender, but at the same time it has many misconceptions too, like when one is suffering from any complaints for long duration they suspect that it might be cancer, so you need not unecessarily get tensed yourself with such misconceptions. consult a good doctor in your vicinity and get checked for your troubles. coming to renal calculi, you have just 3mm calculus which can be very easily diluted in couple of days through homoeopathy. consult a good homoeopath near by you and go for medication, your renal stone gets diluted completely and your trouble will be relieved.