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Ultrasound findings may show thickened gall bladder wall, tiny anechoic spaces (Rokitansky–Aschoff sinuses or RAS), and twinkling artifact (or comet-tail reverberation). Comet tail reverberation, which is due to reflections from cholesterol crystals, is a highly specific sign for adenomyomatosis. [8]
On abdominal ultrasound, sinking gallstones usually have posterior acoustic shadowing. In floating gallstones, reverberation echoes (or comet-tail artifact) is seen instead in a clinical condition called adenomyomatosis. Another sign is wall-echo-shadow (WES) triad (or double-arc shadow) which is also characteristic of gallstones. [40]
[4] [5] [6] Other key features that may be seen include wall thickening and ring-down artifacts known as "comet tails" (produced by reverberations of sound between the sinuses). [4] [5] [6] Ultrasound can also distinguish between diffuse, segmental, and localized variants of adenomyomatosis based on morphology. [5] [6]
Comet sign; Comet tail sign (CT thorax) Coned epiphyses; Continuous diaphragm sign; Cupola sign; Cord sign; Corduroy sign; Corkscrew oesophagus; Corkscrew sign; Cortical ring sign; Cottage loaf sign; Cotton wool appearance; Crazy paving sign; Crescent sign; Crowded carpal sign; Cupola sign; Cœur en sabot
A rare comet is still glowing over Ohio. Here's how to see it before it's gone, and won't return for 80,000 years.
Features of benign lesion are: hyperechoic, having coarse, dysmorphic or curvilinear calcifications, comet tail artifact (reflection of a highly calcified object), absence of blood flow in the nodule, and presence of cystic (fluid-filled) nodule. However, the presence of solitary or multiple nodules is not a good predictor of malignancy.
The once-in-a-lifetime comet will come within about 44 million miles (nearly 71 million kilometers) of our planet on Saturday and appear as a bright fireball with a long, extended tail.
This allows for the detection of a pneumothorax with the absence of normal ‘lung-sliding’ and ‘comet-tail’ artifact (seen on the ultrasound screen). Compared with supine chest radiography , with CT or clinical course as the gold standard, bedside sonography has superior sensitivity (49–99% versus 27–75%), similar specificity (95 ...