Abstract
The sign has been originally described on chest radiographs. It is formed by distorted blood vessel(s) and a focal area of atelectatic lung adjacent to pleural thickening. The vessel(s) are seen as curvilinear soft tissue density or densities, extending from the medial margin of the atelectatic lung to the pulmonary hilum. When the vessels are multiple thus there are multiple tails, the vessels are more likely parachute; then, parachute sign may be used (Fig. 5.1). The sign is due to contracted fibrous scarring and shrinking pleural disease with rounded atelectasis. Likewise, on CT, swirling of bronchi and vessels extending from the hilum and converging on the atelectatic lung help produce comet tail appearance [1] (Figs. 5.1 and 5.2).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Lynch DA, Gamsu G, Ray CS, Aberle DR. Asbestos-related focal lung masses: manifestations on conventional and high-resolution CT scans. Radiology. 1988;169:603–7.
Chong S, Lee KS, Chung MJ, Han J, Kwon OJ, Kim TS. Pneumoconiosis: comparison of imaging and pathologic findings. Radiographics. 2006;26:59–77.
Kim GY, Park JY, Han JH, Kim TS, Kim JG. Rounded atelectasis: a brief case report. Korean J Pathol. 2003;37:279–81.
Cavazza A, Roggeri A, Rossi G, et al. Round atelectasis of the lung: clinicopathological study of 6 cases and review of the literature. Pathologica. 2003;95:50–6.
McHugh K, Blaquiere RM. CT features of rounded atelectasis. AJR Am J Roentgenol. 1989;153:257–60.
O’Donovan PB, Schenk M, Lim K, Obuchowski N, Stoller JK. Evaluation of the reliability of computed tomographic criteria used in the diagnosis of round atelectasis. J Thorac Imaging. 1997;12:54–8.
Hansell DM, Bankier AA, MacMahon H, McLoud TC, Muller NL, Remy J. Fleischner Society: glossary of terms for thoracic imaging. Radiology. 2008;246:697–722.
Peacock C, Copley SJ, Hansell DM. Asbestos-related benign pleural disease. Clin Radiol. 2000;55:422–32.
Szydlowski GW, Cohn HE, Steiner RM, Edie RN. Rounded atelectasis: a pulmonary pseudotumor. Ann Thorac Surg. 1992;53:817–21.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Lee, K.S., Han, J., Chung, M.P., Jeong, Y.J. (2014). Comet Tail Sign. In: Radiology Illustrated: Chest Radiology. Radiology Illustrated. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37096-0_5
Download citation
DOI: https://doi.org/10.1007/978-3-642-37096-0_5
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-37095-3
Online ISBN: 978-3-642-37096-0
eBook Packages: MedicineMedicine (R0)