Question:

The typical CT findings seen in swine-origin influenza A (H1N1) virus (S-OIV) pneumonia include?
1. Unilateral involvement.
2. Pleural effusions.
3. Tree-in-bud pattern.
4. Organizing pneumonia-like appearance.
5. Mosaic perfusion.





Answer:

The correct answer for the question "The typical CT findings seen in swine-origin influenza A (H1N1) virus (S-OIV) pneumonia include?" is:

4. Organizing pneumonia-like appearance.



Explanation
1) Unilateral involvement. [On CT, the disease is noted to be more commonly bilateral in nature.]

2) Pleural effusions. [The presence of pleural effusions might be explained by the associated co-morbidities -such as left-sided heart failure- rather than the S-OIV infection itself.]

3) Tree-in-bud pattern. [Centrilobular nodules, tree-in-bud pattern or mosaic perfusion was not noted on CT in any of the reported cases.]

4) Organizing pneumonia-like appearance. [Of note, is a peribronchovascular and subpleural distribution that was observed by some authors and emphasized by others, an appearance which resembles that of organizing pneumonia.]

5) Mosaic perfusion. [Centrilobular nodules, tree-in-bud pattern or mosaic perfusion was not noted on CT in any of the reported cases.]



From the manuscript:
CT Utilization in the Prospective Diagnosis of a Case of Swine-Origin Influenza A (H1N1) Viral Infection
Radiology Case. 2010 Mar; 4(3):24-30


This article belongs to the Chest section.




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From the manuscript

CT Utilization in the Prospective Diagnosis of a Case of Swine-Origin Influenza A (H1N1) Viral Infection

Free full text article: CT Utilization in the Prospective Diagnosis of a Case of Swine-Origin Influenza A (H1N1) Viral Infection

Abstract
The purpose of this paper is to demonstrate the potential role of CT in the early diagnosis of swine-origin influenza A (H1N1) virus (S-OIV) pneumonia. We present a case of acute influenza-like illness in which the CT findings of peribronchovascular and subpleural ground-glass opacities and consolidation resembled organizing pneumonia, and lead the radiologist to prospectively and correctly suggest the diagnosis of S-OIV infection.






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