FIG. 1.

μCT appearance of stones with morphological evidence of RPAs. Both stones here were collected from the same patient. (A) One of seven attached stones was removed during the procedure, all of which showed RPAs. Upper left, photo of stone after removal, on mm grid paper. Background is 3D surface rendering of μCT image stack. Upper right is portion of μCT image slice showing lumen of tubule captured in cross-section. Lower right shows ureteroscopic view of papilla before stone was removed; inset shows stone and eroded regions colorized. (B) Spontaneously passed stone collected by patient before procedure. RPA is hidden in photo, upper left, but clearly seen in surface rendering, background. Magnified view of RPA shows evidence of lumens (inset), with appearance somewhat obscured, likely because of mineral deposited on the RPA from the urine while the stone was being passed. 3D, three-dimensional; RPAs, Randall's plaque anchors.