“…It is reported that nontraumatic cases often have co-existing conditions such as renal cysts, a prenchymal hamartomas, other renal tumors, or evidence of chronic infection in association with obstruction. 1,9,11,12,15 These underlying conditions can be divided into three clusters. Four cases, who consequently underwent nephrectomy, had renal benign tumors, that is, hamartoma.…”