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New studies on papillary calculi
The Journal of Urology
|May 1, 1987
Summary
Papillary kidney stones, often overlooked, were found in over 28% of cases. These stones, frequently linked to apatite plaques, indicate a need for detailed microscopic analysis in stone research.
Area of Science:
- Nephrology
- Urology
- Materials Science
Background:
- Kidney stones are a common ailment with diverse compositions.
- The origin and formation patterns of kidney stones, particularly papillary types, require further elucidation.
- Previous studies have underestimated the prevalence of papillary kidney stones.
Purpose of the Study:
- To investigate the prevalence and characteristics of papillary kidney stones.
- To analyze the composition and formation mechanisms of different stone types.
- To assess the significance of microscopic examination in identifying stone patterns.
Main Methods:
- Collection and stereoscopical microscopy of 500 spontaneously passed kidney stones.
- Complementary analysis using infrared spectroscopy, scanning electron microscopy, and EDAX.
- Classification of stones based on papillary and non-papillary patterns and plaque presence.
Main Results:
- 142 true papillary stones (28.4%) were identified.
- Type 1 papillary stones (apatite plaque) showed calcified tubules in some cases.
- Whewellite was a secondary growth in papillary stone types 1 and 2, triggered by plaques.
Conclusions:
- Papillary kidney stones are more common than previously thought.
- Apatite plaques play a crucial role in the formation of calcium oxalate stones.
- Microscopical study is essential for understanding diverse kidney stone patterns, including potential hidden Randall's plaques.