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A calculus (pl.: calculi), often called a stone, is a concretion of material, usually mineral salts, that forms in an organ or duct of the body. Formation of calculi is known as lithiasis ( / ˌ l ɪ ˈ θ aɪ ə s ɪ s / ).
Kidney stone disease, also known as renal calculus disease, nephrolithiasis or urolithiasis, is a crystallopathy where a solid piece of material (renal calculus) develops in the urinary tract. [2] Renal calculi typically form in the kidney and leave the body in the urine stream. [2] A small calculus may pass without causing symptoms. [2]
Upper urinary tract stones that involve the renal pelvis and extend into at least two calyces are classified as staghorn calculi. [citation needed] Although all types of urinary stones can potentially form staghorn calculi, approximately 75% are composed of a struvite-carbonate-apatite matrix. [citation needed]
Jackstone calculus is a type of urinary tract stone characterized by its unique appearance with stippled and spiculated contour, resembling a toy jack. [1] [2] Jackstone calculi are composed of calcium oxalate dihydrate, which gives them their irregular shape. [3] They are often detected in radiological investigations or cystoscopy. [4]
Idiopathic hypercalcinuria (IH) is a condition including an excessive urinary calcium level with a normal blood calcium level resulting from no underlying cause. [1] IH has become the most common cause of hypercalciuria and is the most serious metabolic risk factor for developing nephrolithiasis. [1]
Bladder stones are small mineral deposits that can form in the bladder. In most cases bladder stones develop when the urine becomes very concentrated or when one is dehydrated. This allows for minerals, such as calcium or magnesium salts, to crystallize and form stones. Bladder stones vary in number, size and consistency.
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Lithotomy differs from lithotripsy, where the stones are crushed either by a minimally invasive probe inserted through the exit canal, or by an acoustic pulse (extracorporeal shock wave lithotripsy), which is a non-invasive procedure. Because of these less invasive procedures, the use of lithotomy has decreased significantly in the modern era.