![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwhg-CT4wWUbukvCg6FtYRPHYBYqpNeRWwWxSKge5US5qIQLtWmlCsrVFQV45I8PjsUr35FWL2Em_J5y7oVLIQbi1Z3lFWR0UtTW1NxCseIQ9SIhJIkFIMb18H9cm8VHu2u5i6fIvxQg/s320/rounded+atelectasis-1+77m.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQ1oRNWg4jvto6uN1DrN8IfUS5Bar4lIYn5YPQqOvt2_aE6-N5a1TORLxEIVnhWFZaKOL3gXZYmdicj4HYGIH3nTRX0T6_q4qNWT47u5xC-mDDTGo1sU2SYBik6oseP1TIt3OJ96F_SQ/s280/rounded+atelectasis-2.jpg)
Facts:
- Rounded atelectasis is an unusual form of lung collapse that can simulate lung neoplasm on chest radiography
- Commonly occurs in patients with pleural effusions/thickening
- Mostly attributed to asbestos exposure, but other causes have been identified (i.e. TB, infarction, trauma, uremia, postoperative)
- Men more common than women, average age 60 years
- Pathology = thickened visceral pleura with folding of underlying lung parenchyma. No discrete mass
- FNA is usually unnecessary given characteristic imaging findings
Radiologic Findings
- Rounded, oval (less commonly irregular) subpleural mass
- Curvilinear opacities connecting the mass to pulmonary hilum (Comet-tail sign)
- Volume loss of affected lobe (most common in posterior lower lobe)
- Associated pleural thickening
Reference:
Batra P, Brown K, Hayashi K, Mori M. Rounded atelectasis. J Thorac Imaging 1996;11:187-197.
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