<unk> s are most commonly caused by an underlying autoimmune disease.<unk>  is most commonly due to ANCA-associated vasculitides (e.g., granulomatosis with polyangiitis) or due to anti-basement membrane diseases (e.g., Goodpasture's syndrome). Granulomatosis with polyangiitis usually presents with nasopharyngeal involvement as well, whereas Goodpasture's will not. Microscopic polyangiitis is the most common cause of<unk> . Other causes include systemic lupus erythematosus, eosinophilic granulomatosis with polyangiitis, microscopic polyangiitis, dermatomyositis, polymyositis, mixed connective tissue disease, poststreptococcal glomerulonephritis, rheumatoid arthritis, and systemic sclerosis. Less common causes also include IgA vasculitis and cryoglobulinemic vasculitis. Other etiologies include toxic injury such as paraquat poisoning, infection with hantavirus, leptospirosis, or legionella, or vascular, as seen in nephrotic syndrome when a renal vein thrombosis embolizes to the lungs.
Pulmonary-renal syndrome
Monofixation syndrome
Nephritic syndrome
Capillary leak syndrome
Fat embolism syndrome
Papillorenal syndrome
Multiple organ dysfunction syndrome
Swimming-induced pulmonary edema