Question:

The typical chest radiographic findings seen in swine-origin influenza A (H1N1) virus (S-OIV) pneumonia include?
1. Hilar lymph node enlargement.
2. Pleural effusions.
3. Mediastinal enlargement.
4. Ground-glass opacities are predominantly seen as an early finding.
5. Commonly show upper lung zone predominance.





Answer:

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

4. Ground-glass opacities are predominantly seen as an early finding.



Explanation
1) Hilar lymph node enlargement is not a typical finding. [Mediastinal or hilar lymph node enlargement is not a described feature of S-OIV.]

2) Pleural effusions is not a typical finding. [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) Mediastinal enlargement was not described as a finding. [[Mediastinal or hilar lymph node enlargement is not a described feature of S-OIV.]

4) Ground-glass opacities are predominantly seen as an early finding. [Early in the course of the disease, ground-glass opacities predominate.]

5) Lower lung zones are more commonly involved than other lung regions. [Although the disease has been described to radiographically involve variable areas of the lung, the lower zones are most commonly involved.]



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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