Pelvicalyceal dilatation and the presence of several masses

A 45 year old woman presents with acute pain that radiates from his left loin to his left groin. The pain comes for a few seconds, and then goes. It is sharp in nature. A plain abdominal X Ray is unremarkable. Ultrasound examination demonstrates pelvicalyceal dilatation and the presence of several masses. The most likely diagnosis is:

1- Papillary necrosis
2- Recurrent UTIs
3- Cystine renal stones
4- Uric acid renal stones
5- Renal cell carcinoma