Editing Bladder stone (section)

===Jackstone calculus===
{{main|Jackstone calculus}}

Jackstone calculi are rare bladder stones that have an appearance resembling toy [[Knucklebones|jacks]]. They are almost always composed of calcium oxalate dihydrate and consist of a dense central core and radiating [[wikt:spicule|spicules]]. They are typically light brown with dark patches and are usually formed in the urinary bladder and rarely in the upper urinary tract. Their appearance on plain radiographs and computed tomography in human patients is usually easily recognizable. Jackstones often must be removed via [[Bladder stone#Cystolithotomy|cystolithotomy]].<ref name="SinghGoyal2011">{{cite journal|last1=Singh|first1=KamalJeet|last2=Goyal|first2=Adarsh|last3=Tiwari|first3=Anuj|title=Jackstone: A rare entity of vesical calculus|journal=Indian Journal of Urology|volume=27|issue=4|year=2011|pages=543–4|issn=0970-1591|doi=10.4103/0970-1591.91449|pmid=22279326|pmc=3263228 |doi-access=free }}</ref>