![comet tail artifact comet tail artifact](https://f6publishing.blob.core.windows.net/c35752bb-e58c-40b2-95e1-d73eee7614e4/WJR-2-83-g003.jpg)
No malignancies were detected in any of the 150 thickened gallbladder lesions. There were no significant differences in the average length, thickness, or number of comet tail artifacts among the four diagnoses. There were no statistically significant differences in any of the clinical and ultrasonographic findings, with the exception of gallstones (P=0.007), among the four diseases. RESULTS: All gallbladder lesions exhibiting the comet tail artifact on ultrasound examination were confirmed as benign gallbladder diseases after cholecystectomy, including 71 cases of adenomyomatosis (47.3%), 74 cases of chronic cholecystitis (49.3%), two cases of xanthogranulomatous cholecystitis (1.3%), and three cases of cholesterolosis (2.0%) there were two cases of coexistent chronic cholecystitis and low-grade dysplasia. In this case, these reverberations are referred to as comet-tail or ring- down artifacts.11,12 In reverberations, the assumption that the ultrasound has. This study evaluated the differences in clinical and imaging findings among pathologic diagnoses. The extent of the involved lesion was classified as localized or diffuse, depending on the degree of involvement and the anatomical section of the gallbladder that was involved. METHODS: This retrospective study reviewed the clinical findings, imaging findings, preoperative ultrasonographic diagnoses, and pathological diagnoses of 150 patients with comet tail artifacts who underwent laparoscopic cholecystectomy with pathologic confirmation. Horizontal artifacts and absent lung sliding, when combined, had a sensitivity and a negative predictive value of 100 and a specificity of 96.5. This pattern was present all over the lung surface in 86 of 92 patients with diffuse alveolar-interstitial syndrome (sensitivity of 93.4). The ultrasonic feature of multiple comet-tail artifacts fanning out from the lung surface was investigated. N2 - PURPOSE: The aim of this study was to evaluate whether the comet tail artifact on ultrasonography can be used to reliably diagnose benign gallbladder diseases. The antero-lateral chest wall was examined using ultrasound. Ultrasound detection of the "comet-tail artifact" at the anterior chest wall allows complete pneumothorax to be discounted.T1 - Comet tail artifact on ultrasonography: is it a reliable finding of benign gallbladder diseases? Horizontal artifacts and absent lung sliding, when combined, had a sensitivity and a negative predictive value of 100% and a specificity of 96.5%. Setting: The medical ICU of a university-affiliated teaching hospital. The significance of these artifacts for the diagnosis of pneumothorax was assessed. Horizontal artifacts had a sensitivity and a negative predictive value of 100% and a specificity of 60% for the diagnosis of pneumothorax. Objective: Ultrasound artifacts arising from the lung-wall interface are either vertical (comet-tail artifacts) or horizontal.
Comet tail artifact series#
Ultrasound as well as computed tomography showed anterior consolidation or anterior pleural effusion in three cases. The comet-tail artifact is a case of reverberation where two closely spaced surfaces generate a series of closely spaced discrete echoes. In the pneumothorax-free group, "comet-tail artifacts" were present in 87 cases and exclusive horizontal artifacts in 56. Ultrasound showed exclusive horizontal artifacts in all 41 analyzable cases of complete pneumothorax.
![comet tail artifact comet tail artifact](https://sites.google.com/site/stephsultrasound/_/rsrc/1468756544314/home/physics-fun/artifacts/comet%20tail.jpg)
The test was defined as positive for complete pneumothorax when only horizontal artifacts were visible, and negative when artifacts arising from the pleural line and spreading up to the edge of the screen (referred to as "comet-tail artifacts") were present.
Comet tail artifact portable#
The anterior chest wall was investigated in supine patients using a portable device. We compared 41 complete pneumothoraces with 146 hemithoraces in 73 critically ill patients in which computed tomography showed absence of pneumothorax. Tomodensitometric correlations showed that the thickened sub-pleural interlobular septa, as well as ground-glass areas, two lesions present in acute pulmonary edema, were associated with the presence of the comet-tail artifact.
![comet tail artifact comet tail artifact](https://m4.healio.com/~/media/images/news/print/endocrine-today/2014/september/examples_of_reverberation_artifact2.jpg)
The medical ICU of a university-affiliated teaching hospital. Ultrasound artifacts arising from the lung-wall interface are either vertical (comet-tail artifacts) or horizontal.