title: "Falling snowflakes," an ultrasound sign of hydatid sand.
abstract: It has been claimed that the distinction between a simple cyst and a simple noncomplicated hydatid cyst cannot be made by ultrasound examination. It is very important to make this distinction before attempting a diagnostic or therapeutic puncture of a cyst, at least in geographic areas where echinococcosis is endemic. The authors report an ultrasound sign that makes this differential diagnosis possible.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004443:Echinococcosis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D014463:Ultrasonography