ICU	Intensive care unit
PLAPS	Posterolateral and/or pleural alveolar syndrome
COPD	Chronic obstructive pulmonary disease
ARDS	Acute respiratory distress syndrome
CAP	Community-acquired pneumonia
HCAP	Healthcare-associated pneumonia
AIDS	Acquired Immuno Deficiency Syndrome
CEUS	Contrast-enhanced ultrasound
HRCT	High-resolution computed tomography