Abstracts

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E2224. Review of Lobar Atelectasis and Mixed Lobar Collapse on Radiographic and CT Presentation
Authors
  1. Livia Frota Lima; Mayo Clinic
  2. Lara Walkoff; Mayo Clinic
  3. Kianoush Ansari Gilani; Case Western Reserve University School of Medicine
  4. Amit Gupta; Case Western Reserve University School of Medicine
  5. Robert Gilkeson; Case Western Reserve University School of Medicine
  6. Yasmeen Tandon; Mayo Clinic
Background
Lobar atelectasis is a common imaging finding that often has pathognomonic appearance. It is essential that radiologists be able to rapidly recognize lobar collapse and distinguish it from other mimics so that appropriate treatment and diagnostic workup can be initiated.

Educational Goals / Teaching Points
At the end of this presentation the viewer should be able to: Rapidly identify lobar and mixed lobar collapse on radiographs and CT, recognize associated signs as well as pitfalls, and review further workup and treatment for lobar atelectasis.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Will first discuss etiologies of lobar collapse such as mucus plugging, obstructing mass, and foreign bodies. Will then do a case based pictorial review of Complete Left Lung Collapse presenting both radiographs and CT correlates. Radiograph and CT correlates for complete right lung collapse will then be reviewed. We will then present imaging findings for unilobar collapse including right upper lobe collapse; right middle lobe collapse; right lower lobe collapse; left upper lobe collapse; and left lower lobe collapse. Different combinations of mixed lobar collapse will be reviewed as well as potential pitfalls or mimics. Finally, we will discuss further workup and treatment options for lobar collapse.

Conclusion
Lobar atelectasis often has pathognomonic appearance which is essential to recognize so that appropriate treatment and diagnostic workup can be initiated.