“…14,17 Such techniques can help identify rare renal calculi, such as xanthine, dihydroxyadenine, matrix, fake or 'Munchausen' calculi, drug-containing calculi or atypical ones such as polycyanoacrylate. [14][15][16] In summary, accurate and timely laboratory diagnosis of urinary tract calculi is important for prompt clinical management as is the awareness of rare calculi as reported by Kotaska et al 1…”