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Lung

, Volume 196, Issue 1, pp 1–10 | Cite as

Infectious and Non-Infectious Diseases Causing the Air Crescent Sign: A State-of-the-Art Review

  • Joyce Betta Sevilha
  • Rosana Souza Rodrigues
  • Miriam Menna Barreto
  • Gláucia Zanetti
  • Bruno Hochhegger
  • Edson Marchiori
State of the Art Review
  • 162 Downloads

Abstract

Aspergilloma, also known as mycetoma or fungus ball, is characterized by a round or oval mass with soft-tissue attenuation within a preexisting lung cavity. The typical computed tomography (CT) aspect of an aspergilloma is a mass separated from the wall of the cavity by an airspace of variable size and shape, resulting in the air crescent sign, also known as the meniscus sign. This CT feature is non-specific and can be simulated by several other entities that result in intracavitary masses. This review describes the main clinical and imaging aspects of the infectious and non-infectious diseases that may present with fungus-ball appearance, including pulmonary hydatid cyst, Rasmussen aneurysm, pulmonary gangrene, intracavitary clot, textiloma, lung cancer, metastasis, and teratoma, focusing on the differential diagnosis.

Keywords

Air crescent sign Aspergillosis Fungus ball Computed tomography Pulmonary diseases 

Notes

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Federal University of Rio de JaneiroRio de JaneiroBrazil
  2. 2.Instituto D’Or para Pesquisa e EducaçãoRio de JaneiroBrazil
  3. 3.Santa Casa de Porto AlegrePorto AlegreBrazil

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