Rare Presentation of Pulmonary Alveolar Proteinosis Causing Acute Respiratory Failure

Table 1

Differential diagnosis of crazy paving on CT imaging, adapted from De Wever et al. [9].

Acute diseases	Subacute/chronic diseases
Pulmonary edema	Usual interstitial pneumonia
Infection (viral, bacterial, Pneumocystis jirovecii, and mycoplasma)	Nonspecific interstitial pneumonia
Pulmonary hemorrhage	Pulmonary alveolar proteinosis
Acute interstitial pneumonia	Organizing pneumonia
Acute respiratory distress syndrome	Vasculitis (Churg-Strauss syndrome)
Radiation pneumonitis	Eosinophilic pneumonia (chronic)
Eosinophilic pneumonia	Malignancy
	Lymphangitic spread of malignancy
	Sarcoidosis
	Lipoid pneumonia
	Alveolar microlithiasis
	Barium aspiration