Urolithiasis (renal calculi) is a very common disease affecting up to 1 in 10 individuals during their lifetime. Formation of the stones can occur anywhere along the urinary tract but most commonly occurs within the kidneys. Risk factors for stone formation include male gender; any condition that affects the composition of the urine, such as hypercalciuria or high urine oxalate; systemic metabolic disorders, such as cystinuria and gout; dietary factors, such as high oxalate and animal protein intake, low fluid intake; and environmental factors, such as high dry temperatures. 80% of renal calculi are unilateral. Symptoms of urolithiasis include excruciating pain, haematuria, nausea, vomiting, fainting, dysuria and urgency. Symptoms depend on the size and the site of the calculus. Urolithiasis can be asymptomatic especially if the stones are formed and remain within the renal pelvis or bladder. Symptoms occur when the stones move into the ureter. Pain from calculi is usually colicky and typically severe in nature; occurring in paroxysms. The flank is the most common site for pain but pain can occur anywhere along the urinary tract and into the genitals. Pain resolves on passage of the stone. Haematuria can be gross or microscopic. There are four main types of renal calculi: Calcium stones are the most common, comprising 70% of all stones. They are made up of calcium oxalate or a mixture with calcium phosphate. Hypercalciuria, hypercalcemia and hyperoxaluria are common causes of these stones. Struvite stones make up 5-10% of stones. They are comprised of magnesium ammonium phosphate. These are commonly formed as a result of proteus infections and lead to the formation of very large “staghorn” calculi. Uric acid stones make up 5-10% of calculi. These occur in patients with hyperuricemia, such as gout and chronic leukaemias. The remainder are made up of cysteine, which is due to impaired renal reabsorption of amino acids such as cystine.
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