Stones appear on CT films mainly as high-density shadows with a whitish color, the whiter the color the higher the density, similar to the appearance of bone. On CT films, the presence of whitish colored shadows within the ureter and bladder of the kidney are to be considered as possible stones, but they need to be differentiated from calcifications in the kidney or urinary system, for example, the most common calcifications are calcifications within the kidney and calcifications in the prostate. Sometimes it is easier to mistake them for stones and requires reading and judgment by an experienced physician. Ureteral stones are sometimes difficult to determine because they are sometimes indistinguishable from venous stones in the pelvis, or calcified shadows in the blood vessels, both of which can appear as high-density shadows, or whitish colored plaques, but require further integration with the patient’s symptoms and urinary tract imaging for a comprehensive determination. Clinically, there are also negative stones, which do not appear as high-density shadows on CT films, but may be accompanied by hydronephrosis, and the presence of negative stones needs to be determined in conjunction with the patient’s symptoms.