A hospice intensivist

Pneumonia (bacterial, fungal, viral...)
cryptogenic
malignancy
pulmonary vascular disease

aspergillus pneumonia
Adenocarcinoma

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BAL:
early ALI/ARDS neutrophilia
resolution macrophage
eosinophilia acute eosinophilic pneumonia
lymphocytosis acute hypersensitivity pneumonitis
acute BOOP

2015-12-24 update:
Some authors called them "pseudo-ARDS"

The ten diseases that look like ARDS 

2016-4-27
"Imitators" of the ARDS: implications for diagnosis and treatment.
http://www.ncbi.nlm.nih.gov/pubmed/15078770