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Endoscopic ultrasound diagnosis of Liesegang rings.

Liesegang rings are rare, acellular, spherical to elongated, concentrically laminated, ring-like structures that range from 5 microns to 820 microns in diameter [1, 2]. They are nonpolarizeable and are characterized by faint radial striations and an amorphous central core [3]. Liesegang rings are most commonly identified in areas of hemorrhage, inflammation, or necrosis, and in renal and perirenal cysts, and can be mistaken for parasites such as the giant kidney worm, Dioctophyma renale [4,5]. We describe the first known case of Liesegang rings diagnosed by endoscopic ultrasound-guided fine-needle aspiration.