CTICasesCommunity-Acquired Nectizing Pneumonia
Imaging findings
Frontal chest radiograph is normal or shows only very subtle retrocardiac haziness. The lateral view demonstrates a rounded opacity with internal cavitation and an air-fluid level projecting directly over the lower thoracic spine. CT confirms a necrotizing lung infection with cavitation in the posterior basal segment of the left lower lobe.
Key takeaways
Nectizing pneumonias, often caused by anaerobic organisms or aspiration, commonly involve the dependent segments of the lungs (such as the posterior basal segments of the lower lobes). Because these lesions can be completely hidden by the heart on frontal radiographs, the lateral projection is essential for their detection and characterization.
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