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A 58-yeаr-оld mаle with а past medical histоry оf gouty arthritis presents to the emergency with complaints of acute onset of flank pain with radiation to the groin. He reported the pain appears to be worse with movement. Other associated symptoms are painful urination and blood-tinged urine. The clinical exam reveals a distressed male who grimaced while moving to try to find a comfortable position. He complained of severe pain in the costovertebral angle with percussion, and abdominal exam was negative. A urinary analysis revealed the following: color = cloudy, pH = 4.5, 10 red blood cells per high power field, 0 WBCs, and positive uric acid crystals. Considering examination findings and urinary analysis results, the most likely diagnosis is: