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Scanning electron micrograph of the surface of a kidney stone showing tetragonal crystals of weddellite (calcium oxalate dihydrate) emerging from the amorphous central part of the stone (the horizontal length of the picture represents 0.5 mm of the figured original) Multiple kidney stones composed of uric acid and a small amount of calcium ...
A kidney stone is a hard object, which can be as small as a grain of salt or as big as a golf ball, made from chemicals—calcium oxalate, uric acid, struvite, and cystine—found in our urine ...
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A number of important medical conditions are caused by stones: [citation needed] Nephrolithiasis (kidney stones) Can cause hydronephrosis (swollen kidneys) and kidney failure; Can predispose to pyelonephritis (kidney infections) Can progress to urolithiasis; Urolithiasis (urinary bladder stones) Can progress to bladder outlet obstruction
Figure 18. Renal stone located at the pyeloureteric junction with accompanying hydronephrosis. [1] With US, larger stones (>5–7 mm) within the kidney, i.e., in the calyces, the pelvis and the pyeloureteric junction, can be differentiated, especially in the cases with accompanying hydronephrosis (Figure 18 and Figure 19).
The signs and symptoms of hydronephrosis depend upon whether the obstruction is acute or chronic, partial or complete, unilateral or bilateral.Hydronephrosis that occurs acutely with sudden onset (as caused by a kidney stone) can cause intense pain in the flank area (between the hips and ribs) known as a renal colic.