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A 74-year-old man presents to the emergency department because of pain and hematuria that started acutely today. His pain was initially in the flank, but has now moved to the lower abdomen. He is afebrile and denies nausea and vomiting. CT scan of the chest and abdomen with contrast is negative for abdominal aortic aneurysm or dissection, and shows no stones in the ureters. His past medical history is significant for coronary artery disease. Chest x-ray and abdominal x-ray are negative for pathology.

Which of the following statements about this patient's condition is true?
The patient has struvite stones, as they are radiolucent

The patient has cystine stones, as they are radiolucent

The patient has calcium oxalate stones, as they are radiolucent

The patient has uric acid stones, as they are radiolucent

This patient probably does not have renal stones, as radiography was negative
 
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