magnesium ammonium phosphate stone
magnesium ammonium phosphate stone
A type of kidney stone, which is more common in women, linked to urinary tract infections (e.g., by Proteus spp) that produce specific enzymes. MAPSs can become very large, fill the renal pelvis, develop a staghorn appearance, obstruct the urinary tract and cause kidney damage.
Specimen
Stones obtained surgically or after being “passed” in the urine.
Method
Light microscopy, optical crystallography, IR spectroscopy, X-ray diffraction.Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
magnesium ammonium phosphate stone
Struvite stone A type of stone more common in ♀, linked to UTIs–eg, by Proteus spp, which produce specific enzymes; MAPSs can become very large, fill the renal pelvis, develop a staghorn appearance, obstruct the urinary tract and cause kidney damageMcGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive
The struvite stone is also known as the triple phosphate or
magnesium ammonium phosphate stone as well as the 'infection stone' given its strong association with recurrent UTIs and an alkaline pH urine.
In general, calcium phosphate stones have the greatest density, followed by calcium oxalate and
magnesium ammonium phosphate stones. Cystine calculi are only faintly radiodense, while uric acid stones are usually entirely radiolucent.
Magnesium ammonium phosphate stones account for 10-15% of kidney stones.
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