comet tail sign

com·et tail sign

in chest radiology, the curved appearance of pulmonary arteries and veins associated with rounded atelectasis, fibrosis associated with organizing pleurisy. Synonym(s): comet sign

Imaging Blood vessels Comet tail sign A term referring to the CT appearance of a tapering, noncalcified vein, adjacent to a rounded phlebolith, which serves to differentiate it from a stone in the ureter
Imaging Gallbladder A term referring to reverberation artifacts seen by ultrasonography within a thickened wall of the gallbladder, strongly suggesting small cholesterol crystals within Rokitansky-Aschoff sinuses in adenomyomatosis, which is usually asymptomatic. Air in emphysematous cholecystitis may produce a similar picture, but in contrast to patients with cholesterol crystals, those with emphysematous cholecystitis are clinically unwell
Imaging Lung Parachute sign A focal area of collapsed lung adjacent to pleural thickening with distortion of blood vessels, which is seen as a curvilinear soft tissue density on a plain chest film, which extends from the lateral pleura to the hilum (this image is more parachute-like, given the multiple ‘tails’); the sign is due to contracted fibrous scarring and shrinking pleuritis with rounded atelectasis, and seen in the folded lung syndrome

单词	comet tail sign
释义	comet tail sign com·et tail sign in chest radiology, the curved appearance of pulmonary arteries and veins associated with rounded atelectasis, fibrosis associated with organizing pleurisy. Synonym(s): comet sign Imaging Blood vessels Comet tail sign A term referring to the CT appearance of a tapering, noncalcified vein, adjacent to a rounded phlebolith, which serves to differentiate it from a stone in the ureter Imaging Gallbladder A term referring to reverberation artifacts seen by ultrasonography within a thickened wall of the gallbladder, strongly suggesting small cholesterol crystals within Rokitansky-Aschoff sinuses in adenomyomatosis, which is usually asymptomatic. Air in emphysematous cholecystitis may produce a similar picture, but in contrast to patients with cholesterol crystals, those with emphysematous cholecystitis are clinically unwell Imaging Lung Parachute sign A focal area of collapsed lung adjacent to pleural thickening with distortion of blood vessels, which is seen as a curvilinear soft tissue density on a plain chest film, which extends from the lateral pleura to the hilum (this image is more parachute-like, given the multiple ‘tails’); the sign is due to contracted fibrous scarring and shrinking pleuritis with rounded atelectasis, and seen in the folded lung syndrome
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