The “rolling” stones

Abstract

Calcium deposition may occur in walls of blood vessels and other conduits, within solid organs and tumors, and in the lumen of nearly every hollow structure. Occasionally, calculi seen in one radiograph may present in a different location on subsequent films. These “rolling stones” can make medical management difficult, and an understanding of the forces influencing the movement of calcifications is important when interpreting radiographs. We present examples of calculi which move over time and discuss the factors involved in their movement.