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Legionnaires' disease in chest x-ray

It is acute gram-negative bacterial pneumonia that occurs in local outbreaks or as sporadic cases and may cause a fulminant, often fatal, pneumonia. Small pleural effusions are common, whereas cavitation and hilar adenopathy are unusual. Most patients respond well to erythromycin, though the radiographic resolution often lags behind the clinical response.

Imaging Findings:
Patchy or fluffy alveolar infiltrate that rapidly progresses to involve adjacent lobes and the contralateral side.