Table 1. Classification grouping and etiologies of uncommon presentations of acute respiratory distress syndrome.

Classification	Groupings	Primary etiology	N
Direct	Inhalation injury	Smoke inhalation, near-drowning	8, 2
Indirect	Drug overdose	Drug overdose	13
	Hepatic failure	End-stage liver disease	7
	Pancreatic	Pancreatitis	16
	Neurogenic	Non-traumatic acute brain injury	8
	Perfusion-related	Hemorrhagic shock, reperfusion injury	8, 1
	Transfusion-related	Multiple transfusions	3
	Toxicity-related	Acute bleomycin toxicity, radiation exposure	2, 1
	Hyper-immune response	Tumor lysis syndrome, dye reaction, Steven-Johnson syndrome, IRIS-HAART	1, 1, 1, 1
	Burns	2nd/3rd degree ≥30% BSA	2
	Malaria	Malaria	1
UNK	Idiopathic	Idiopathic	10

BSA, body surface area; IRIS-HAART, immune reconstitution inflammatory syndrome-highly active anti-retroviral therapy.