Diseases	Distribution								Clinical presentations			Others
	Zones
	U	M	L	SP	C	R	BV	R	Acute	Subacute	Chronic
Extensive pneumonia, especially viral pneumonias	+	+	+			+		+	+			Mixed with small poorly defined nodules and GGO lesions
AIP or ARDS	+	+	+			+		+	+			Subpleural lungs are usually involved; CT air-bronchogram sign
Pulmonary edema	+	+	+			+		+	+			Renal edema; apices and costophrenic angles, spared
DAH	+	+	+			+		+	+			Apices and costophrenic angles, spared

Note: AIP acute interstitial pneumonia, ARDS adult (acute) respiratory distress syndrome, DAH diffuse alveolar hemorrhage, U upper, M middle, L lower, SP subpleural, C central, R random, BV bronchovascular, GGO ground-glass opacity