Onesies, Twosies, not a game of Jackstones

A Large Jackstone Calculus Incidentally Detected on CT Examination: A Case Report With Literature Review

“…It sometimes referred to as a mulberry stone because of its mamillated appearance [5]. The first studies on urinary calculus composition occurred in the 18th century [6] [1,3,4,8]. However, bladder outlet obstruction remains the most common cause of bladder calculi in adults.…”

Jackstone Calculus: A Rare Subtype of Urinary Stone with a Sea-Urchin Appearance

“…Only one case of Jackstone calculi with silica compositions were previously described in a human patient [11]. We are able to find 5 recent reports of Jackstone calculi described on imaging in patients who suffered of prostatic hypertrophy [2,3,[6][7][8]. The diagnosis was usually made incidentally.…”

“…These stone subtypes usually have sharp edges like a sea-urchin or star. This shape also resembles toy jacks [2][3][4][5][6][7][8]. They are made up of calcium oxalate dehydrate with a crystalline structure, which makes them easy to fragment during lithotripsy.…”

“…The typical Jackstone calculus grows at the peripheries, which touch the wall causing the precipitation of mucoproteins from the bladder wall that allows the deposition of more calcium oxalate in the central core. This explains its shape [2][3][4][5][6][7][8]. Jackstone calculi on imaging modality have been extensively described in animals as cattle, cats and dogs.…”

May a comprehensive mineralogical study of a jackstone calculus and some other human bladder stones unveil health and environmental implications?

“…Sample KS012B shows a spiculated appearance that allow us to classify this stone among the socalled Jackstone calculi [34,36,37,[79][80][81][82]. This kind of urinary stone is freely movable in the bladder and is usually composed, according to literature [34,37,82], by calcium oxalate dehydrate.…”