Rounded atelectasis

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Rounded atelectasis, abbreviated RA, is a benign pathology of the lung that may be mistaken for lung cancer.[1][2]


  • Benign clinical diagnosis.
  • May be biopsied to exclude malignancy.
  • Type of lung collapse[3] often associated with asbestos exposure.

Clinical (radiologic findings):[3]

  • Pleural thickening.
  • Mass lesion with "comet tail" (curvilinear opacification of bronchi and vessels).



  • Pleural fibrosis.
  • No features of malignancy.


  • Findings on core biopsy are non-specific.


  • Pleural plaque.

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Lung Lesion, Right Lower Lobe, Core Biopsy:
- Benign fibrous tissue and skeletal muscle.
- NEGATIVE for lung parenchyma. 
- NEGATIVE for evidence of malignancy.

Clinical correlation is suggested.

See also


  1. Sobocińska, M.; Sobociński, B.; Jarzemska, A.; Serafin, Z. (2014). "Rounded atelectasis of the lung: A pictorial review.". Pol J Radiol 79: 203-9. doi:10.12659/PJR.889983. PMID 25045412.
  2. Cherian, SV.; Thampy, E. (Feb 2014). "A solitary lung mass in a 46-year-old man. Rounded atelectasis.". Neth J Med 72 (2): 97, 101. PMID 24659596.
  3. 3.0 3.1 Batra, P.; Brown, K.; Hayashi, K.; Mori, M. (1996). "Rounded atelectasis.". J Thorac Imaging 11 (3): 187-97. PMID 8784732.