What's that in the urinary bladder; uric acid crystals?

This male adult has high serum uric acid levels > 8 mg%

That's the diagnosis of gout.

We scanned his abdomen and this is what we found on sonography:

That's the urinary bladder with loads of crystals. What is the cause? Uric acid crystals in bladder is the likely cause. 

Pyuria or pus in bladder can produce a similar appearance. However, pus wouldn't be so brightly echogenic.

Had a look at the kidneys:

Looked initially to be a medium sized renal calculus. But change of posture produced a shift of the sediments. Clearly a case of a milk of calcium cyst. Measuring 1.5 cms. 

Diagnosis: renal milk of calcium cyst with crystaluria. Possibly the left renal MOC cyst is a calyceal diverticulum. Could it be the cause of release of crystals into the urinary bladder? 

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Bladder crystals on ultrasound