The abnormality on the image demonstrates:  

Which form of renal cystic disease often goes undiagnosed until about the fourth or fifth decade of life, at which time clinical symptoms occur and multiple renal cysts manifest on both kidneys? 

An 18-month-old child presented with the right flank palpable mass. The left kidney was normal.  Most probably the abnormality is:  

Which of the following would be the least likely as a result of acute pyelonephritis? 

The abnormality is located:  

A patient presents with a history of angiomyolipoma. What structures should be evaluated closely for his abnormality because it is the most common location of the abnormality?  

Which kidney tumor sonographically has similar appearance to renal cell carcinoma?  

A 74-year-old man presented with fever and chills status post-surgery for stone removal. Most probably the abnormality is:  

Which of the following may also be referred to as a renal hamartoma?  

In the differentiation of renal mass, which of the following would be the most helpful sonographic feature of emphysematous pyelonephritis?