case_images: PMC10601872_01
case_images: Left panel: Abdominal CT scan. The largest stone in the right kidney had a radiodensity of 636 Hounsfield units. Right panel: Surgically removed kidney stones. Each square is 5 x 5 mm. CT, computed tomography.
case_images: cnd-2023-0013-0001-533442_F01.jpg
case_images: PMC10601872_01_cnd-2023-0013-0001-533442_F01.jpg
case_images: F1
case_images: A computed tomography scan revealed bilateral urolithiasis, multiple stones were present in the right kidney with the largest being 8 mm in diameter, and a few small stones in the left kidney, all less than 3 mm (shown in Fig. 1, left panel). Retrograde intrarenal surgery was performed to remove the stone burden from the right kidney (shown in Fig. 1, right panel).
case_images: Infrared spectra. Top panel is the patient's kidney stone. The bottom panel is the IR spectra of a feline potassium magnesium pyrophosphate pentahydrate stone. The vertical line at 2,000 cm-1 designates a change in the scaling of the x-axis.
case_images: cnd-2023-0013-0001-533442_F02.jpg
case_images: PMC10601872_01_cnd-2023-0013-0001-533442_F02.jpg
case_images: F2
case_images: Subsequently, feline KMgPPi stones were obtained from the Minnesota Urolith Center; the IR spectrum is presented in comparison with the patient's stone IR spectrum (shown in Fig. 2).
case_images: Solubility of feline potassium magnesium pyrophosphate stones was determined at pH 5, 6, and 7 (x-axis). The y-axis is the pyrophosphate concentration at equilibrium at each pH. The highest pyrophosphate level at pH 5 indicates the greatest solubility.
case_images: cnd-2023-0013-0001-533442_F03.jpg
case_images: PMC10601872_01_cnd-2023-0013-0001-533442_F03.jpg
case_images: F3
case_images: As shown in Figure 3, solubility, as judged by PPi concentration, showed a pH dependence, being most soluble at pH 5.