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Early examples of ultrasound detecting radiolucent calculi. (A) Prone longitudinal section 9 cm to the left of the midline shows a dense collection of echoes with a marked acoustic shadow (arrow), indicating a left renal calculus. Reproduced with permission from Radiology (see Pollack et al.). (B) Longitudinal renal echogram demonstrating sonic shadows (arrows). Reproduced with permission from American Journal of Roentgenology (see Edell and Zegel).
