Double bleb sign : Appearance of amnion and yolk sac at 5-6 weeks. Embryo lies between amnion and yolk sac
Double bubble sign : Sign of duodenal atresia and other forms of duodenal obstruction.
Double decidua sign : Sign of early normal intrauterine gestation.
Double density sign (cardiac) : Sign of left atrial enlargement when right side of the left atrium pushes into the adjacent lung.
Double density sign (Nucs) : Pattern of uptake that may be seen on bone scans in patients with osteoid osteomas.
Double duct sign : Simultaneous dilatation of the common bile and pancreatic ducts that is generally caused by a tumor in the pancreatic head.
Double PCL sign : MRI sign of a bucket-handle meniscal tear.
Double track sign : :Appearance of hypertrophic pyloric stenosis that may be seen on upper GI series.
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