DDx
- Goodpasture’s syndrome
- Severe congestive heart failure (pulmonary edema & prerenal azotemia)
- Renal failure (with hypervolemia & pulmonary edema)
- Microscopic polyangiitis (polyarteritis nodosa)
- Systemic lupus erythematosus (SLE)
- Henoch-Schönlein purpura
- Wegener’s granulomatosis
- Churg-Strauss syndrome
- Legionnaire’s disease
- Renal vein thrombosis with pulmonary embolism