Necrotizing granulomatous vasculitis of medium and small arteries;
4 C's: C-Anca, C-shaped nose deformity, Cough, Crescents (because of increased progression to Rapid Progressive Glomerulonephritis)
Sinusitis, recurrent nasal congestion, hemoptysis, hemorrhagic pulmonary issues (look for this in the history to help distinguish from Goodpasture's);
Imaging: nodular densities may be seen. (as well as infiltrates)
Treatment: Steroids (ie. prednisonse)
Type 2 Hypersensitivity
Ab against BM proteins (of glomerular BM and alveolar BM) (Anti-GBM)
I read the more thorough explanation from ubcd above.
I guess from a question stand point though, the question write would have to include either a positive C-ANCA or a history of the sinopulmonary infections to point towards Wegner's over good pasteures.