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Mediastinal pseudomass: pneumonia and atelectasis behind the left pulmonary ligament
N Malmgren1, S Laurin, K Ivancev
1Department of Radiology, University of Lund, Sweden.
Insights
Left lower lobe pneumonia in children can appear as a paramediastinal mass due to atelectasis or infiltration. This radiographic finding, linked to the pulmonary ligament, has a benign clinical course.
Area of Science:
- Pediatric Radiology
- Thoracic Imaging
- Pulmonology
Background:
- Pneumonia in children can present with atypical radiographic findings.
- Paramediastinal masses in pediatric patients require careful differential diagnosis.
Purpose of the Study:
- To describe an unusual radiographic appearance of left lower lobe pneumonia in children.
- To highlight the association between pulmonary ligament anatomy and this presentation.
- To emphasize the benign clinical course of this condition.
Main Methods:
- Retrospective review of 12 pediatric cases over 6 years.
- Analysis of radiographic findings suggestive of a paramediastinal mass.
- Correlation with clinical outcomes.
Main Results:
- Identified 12 children with left lower lobe pneumonia mimicking a paramediastinal mass.
- Attributed the appearance to atelectasis or infiltration related to the pulmonary ligament.
- Observed a benign clinical course in all affected children.
Conclusions:
- Left lower lobe pneumonia posterior to the pulmonary ligament can mimic a paramediastinal mass in children.
- This radiographic appearance is likely due to atelectasis or infiltration secondary to pulmonary ligament variations.
- The condition typically follows a benign clinical trajectory.
Abstract:
In children, left lower lobe pneumonia posterior to the pulmonary ligament may mimic a paramediastinal mass. Over a period of 6 years we have seen 12 children with this unusual appearance, which we attribute to a peculiar type of atelectasis or infiltration of the left lower lobe or a segment of it. The radiographic appearance is thought to be the result of incomplete anchoring of the left lung by a short pulmonary ligament. The radiographic findings are demonstrated, and the benign clinical course is emphasized.