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The comet tail sign is a radiological finding seen in chest CT. It refers to a specific appearance resembling a comet's tail, characterised by a bright, streaky opacity due to the presence of a round atelectasis in chest CT.
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 ...
"comet tail" artifact as sound waves bounce off intranodular colloid documented progressive increase in size of nodule on ultrasound Although ultrasonography is a very important diagnostic tool, this method is not always able to separate benign from malignant nodules with certainty.
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 CT scan, it may show rosary sign ...
Comet sign; Comet tail sign (CT thorax) ... Rat tail sign; Reverse 3 sign; ... Target sign (Ultrasound) Teacup calcification (breast)
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 2008 financial crisis didn’t happen overnight. Rather, it was the culmination of a series of factors. The details of what led to the financial crisis are detailed in the 2010 book “The Big ...