Kidney stone pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

Pathophysiology

Pathogenesis

  • It is understood that nephrolithiasis is the result of combination of different mechanism responsible for different types of stones:
Calcium stones

The following table summarizes major mechanism of stone formation:[8][9][10][11]

Type of stone/Mechanism Cause Pathophysiology Stone composition Labs
All stones Low urine volume

(raises production of solutes)

Reduced intake or increased loss of water Renal water conservation All stones
  • Urine volume <1 L per day
  • Osmolarity >600 mOsm/kg
Calcium stones Hypercalciuria

(raises saturation of calcium salts)

Absorptive hypercalciuria Increased absorption in gut Calcium oxalate or phosphate Urine calcium concentrations >6 mmol/L (240 mg) per day
Hyperparathyroidism Increased absorption in gut and bone release High concentrations of parathyroid hormone
Immobilization Bone resorption High concentrations of vitamin D
Excess of sodium in the diet Sodium-induced physiological renal calcium leak. Possible component of gut hyperabsorption Urine sodium concentrations >200 mmol/L per day
Excess of protein or acid in diet Protein-induced bone loss and renal leak.
Range of monogenic disorders Bone loss, gut hyperabsorption, and renal leak in various combinations
Hypocitraturia

(raises levels of ionised calcium and reduces inhibitor activity against calcium salts)

Renal tubular acidosis (distal type) Renal defense of acid-base balance Calcium phosphate
  • Urine citrate concentrations <1·7 mmol/L per day
  • Urine pH high
High acid load (absence of detectable acidemia) Physiological hypocitraturia Calcium oxalate or phosphate
  • Urine citrate concentrations <1·7 mmol/L per day
  • Urine pH low
Hyperoxaluria

(raises saturation of calcium oxalate)

Excess of oxalate in diet Increased delivery of luminal oxalate Calcium oxalate Urine oxalate concentrations >70·7 mmol/L per day
Bowel pathology Reduced formation of luminal calcium and calcium-oxalate complex
Increased production of endogenous oxalate Primary hyperoxaluria (type 1 and type 2)
Hyperuricosuria

(sodium urate precipitation causes crystallization of calcium salts)

High purine intake Raised production and urinary excretion of sodium and urate
  • Urine uric acid concentrations >600 mg per day
  • Hyperuricaemia
Myeloproliferative diseases
Enzymatic defects Urine uric acid concentrations >600 mg per day
Uricosuric drugs Hypouricaemia
Genetic primary renal leak Increased excretion of uric acid
Uric acid stones Low urine pH or hyperuricosuria Titrates urate to poorly soluble uric acid Uric acid Urine pH <5·5
Cystine stones Cystinuria Congenital mutations of dibasic aminoacid transporter subunits rBAT and b0+AT Renal leak of basic aminoacids Cystine Urine concentrations of cystine high (>150 μmol/mmol creatinine)
Infection stones Urinary tract infection Urea-splitting organisms Production of ammonium and bicarbonate from urea

Genetics

Associated Conditions

Gross Pathology

  • On gross pathology, the characteristic findings of nephrolithiasis are:
    • Location = 80% unilateral, usually in calyces, pelvis or bladder
    • Size=variable, 2-3 mm usually
    • All stones contain an organic matrix of mucoprotein
    • Shape:
      • Struvite stone= staghorn calculus
  • Nephrolithiasis, Source: Wikimedia commons[12]

    Nephrolithiasis, Source: Wikimedia commons[12]

  • Staghorn shape of struvite stones, Source: Wikimedia commons[13]

    Staghorn shape of struvite stones, Source: Wikimedia commons[13]

  • Renal calculi, different shapes and sizes, Source: Wikimedia commons[14]

    Renal calculi, different shapes and sizes, Source: Wikimedia commons[14]

  • Kidney stone with a maximum dimension of 5mm, Source: Wikimedia commons[15]

    Kidney stone with a maximum dimension of 5mm, Source: Wikimedia commons[15]

Microscopic Pathology

  • On microscopic histopathological analysis, the characteristic findings of nephrolithiasis are:
    • Shapes of different stones/crystals are different:
      • Cysteine= hexagonal
      • Struvite= coffin lid shape
      • Calcium oxalate= pyramid shape
      • Calcium oxalate= dumbbell shape
      • Uric acid= rectangular/rhomboidal
    • Oxalate crystals are highlighted by polarized light
    • Foreign body giant cells and macrophages are seen with the stones
  • Type of stones. Light microscopy of urine crystals. (A) Hexagonal cystine crystal (200X); (B) coffin-lid shaped struvite crystals (200X); (C) pyramid-shaped calcium oxalate dehydrate crystals (200X); (D) dumbbell-shaped calcium oxalate monohydrate crystal (400X); (E) rectangular uric acid crystals (400X); and (F) rhomboidal uric acid crystals (400X).[16]

    Type of stones. Light microscopy of urine crystals. (A) Hexagonal cystine crystal (200X); (B) coffin-lid shaped struvite crystals (200X); (C) pyramid-shaped calcium oxalate dehydrate crystals (200X); (D) dumbbell-shaped calcium oxalate monohydrate crystal (400X); (E) rectangular uric acid crystals (400X); and (F) rhomboidal uric acid crystals (400X).[16]

  • Deposits of oxalate with variable size and form; they occupy mainly distal tubules. The asterisks indicate proximal tubules, which usually do not contain these crystals, H&E seen with polarized light, X200[17]

    Deposits of oxalate with variable size and form; they occupy mainly distal tubules. The asterisks indicate proximal tubules, which usually do not contain these crystals, H&E seen with polarized light, X200[17]

  • Medullary interstitial urate crystal deposits in chronic nephropathy by urates as seen after Masson's trichome stain X400[18]

    Medullary interstitial urate crystal deposits in chronic nephropathy by urates as seen after Masson's trichome stain X400[18]

  • Calcium oxalate dihydrate crystals under Scanning Electron Micrograph (SEM) taken at 30 KV. Source: Wikimedia commons[19]

    Calcium oxalate dihydrate crystals under Scanning Electron Micrograph (SEM) taken at 30 KV. Source: Wikimedia commons[19]

  • Density-dependent color scanning electron micrograph of kidney stone, Source: Wikimedia commons[20]

    Density-dependent color scanning electron micrograph of kidney stone, Source: Wikimedia commons[20]

References

  1. ↑ Pak CY (December 1991). "Etiology and treatment of urolithiasis". Am. J. Kidney Dis. 18 (6): 624–37. PMID 1962646.
  2. ↑ Mandel NS, Mandel GS (December 1989). "Urinary tract stone disease in the United States veteran population. II. Geographical analysis of variations in composition". J. Urol. 142 (6): 1516–21. PMID 2585627.
  3. ↑ Messa P, Marangella M, Paganin L, Codardini M, Cruciatti A, Turrin D, Filiberto Z, Mioni G (September 1997). "Different dietary calcium intake and relative supersaturation of calcium oxalate in the urine of patients forming renal stones". Clin. Sci. 93 (3): 257–63. PMID 9337641.
  4. ↑ Messa P, Marangella M, Paganin L, Codardini M, Cruciatti A, Turrin D, Filiberto Z, Mioni G (September 1997). "Different dietary calcium intake and relative supersaturation of calcium oxalate in the urine of patients forming renal stones". Clin. Sci. 93 (3): 257–63. PMID 9337641.
  5. ↑ Trinchieri A (February 2013). "Diet and renal stone formation". Minerva Med. 104 (1): 41–54. PMID 23392537.
  6. ↑ Prezioso D, Strazzullo P, Lotti T, Bianchi G, Borghi L, Caione P, Carini M, Caudarella R, Ferraro M, Gambaro G, Gelosa M, Guttilla A, Illiano E, Martino M, Meschi T, Messa P, Miano R, Napodano G, Nouvenne A, Rendina D, Rocco F, Rosa M, Sanseverino R, Salerno A, Spatafora S, Tasca A, Ticinesi A, Travaglini F, Trinchieri A, Vespasiani G, Zattoni F (July 2015). "Dietary treatment of urinary risk factors for renal stone formation. A review of CLU Working Group". Arch Ital Urol Androl. 87 (2): 105–20. doi:10.4081/aiua.2015.2.105. PMID 26150027.
  7. ↑ Umekawa T, Chegini N, Khan SR (January 2002). "Oxalate ions and calcium oxalate crystals stimulate MCP-1 expression by renal epithelial cells". Kidney Int. 61 (1): 105–12. doi:10.1046/j.1523-1755.2002.00106.x. PMID 11786090.
  8. ↑ Moe, Orson W (2006). "Kidney stones: pathophysiology and medical management". The Lancet. 367 (9507): 333–344. doi:10.1016/S0140-6736(06)68071-9. ISSN 0140-6736.
  9. ↑ Freitag, Jeffrey; Hruska, Keith (1983). "Pathophysiology of Nephrolithiasis": 523–553. doi:10.1007/978-1-4613-3524-5_16.
  10. ↑ Gambaro G, Fabris A, Abaterusso C, Cosaro A, Ceol M, Mezzabotta F, Torregrossa R, Tiralongo E, Del Prete D, D'Angelo A, Anglani F (May 2008). "Pathogenesis of nephrolithiasis: recent insight from cell biology and renal pathology". Clin Cases Miner Bone Metab. 5 (2): 107–9. PMID 22460990.
  11. ↑ Sakhaee, Khashayar (2009). "Recent advances in the pathophysiology of nephrolithiasis". Kidney International. 75 (6): 585–595. doi:10.1038/ki.2008.626. ISSN 0085-2538.
  12. ↑ By Amadalvarez - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=46706235
  13. ↑ By H. Zell [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons
  14. ↑ By Jakupica - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=45324355
  15. ↑ By RJHall - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4070842
  16. ↑ Han H, Segal AM, Seifter JL, Dwyer JT (July 2015). "Nutritional Management of Kidney Stones (Nephrolithiasis)". Clin Nutr Res. 4 (3): 137–52. doi:10.7762/cnr.2015.4.3.137. PMC 4525130. PMID 26251832.
  17. ↑ http://kidneypathology.com/Imagenes/Diabetes/Oxalato.4.w.jpg
  18. ↑ http://www.kidneypathology.com/English_version/Diabetes_and_others.html
  19. ↑ By Kempf EK - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=18036112
  20. ↑ By Sergio Bertazzo - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=45316797

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