Uric acid stones
Calcium stones are the most common type. These stones are visible on plain x-rays which can make them easier to treat. Calcium stones are diet related in general.
Uric acid stones are invisible on plain x-rays but can be seen on CT scans. They can only form in acidic urine. It is possible to dissolve these stones with medication.
Cystine stones are very rare and are caused by inherited derangements in biochemical processes. These stones appear faint on x-ray but are very hard. They tend to not respond to non-invasive forms of treatments, like lithotripsy.
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