Nicely written article, with good description of imaging findings.
 
Inclusion of alternative name Granulomatosis with polyangitis (GPA), will help in this article being more widely available for international audience.
 
 In 2011, the American College of Rheumatology (ACR), the American Society of Nephrology (ASN) and the European League Against Rheumatism (EULAR) resolved to change the name to granulomatosis with polyangiitis.
 
The male is to female ratio of prevalence of Wagner's granulomatosis has been quoted in literature to as being 2:1  to 1:1, in various literature.
 
Most commonly, GPA affects the nasal sinuses, lungs and kidneys, but can also affect the eyes, ears, skin, nerves, joints and other organs. Because of the variety of potential organ involvement, a wide range of symptoms can develop over days to months. For 90% of people, the first symptoms appear in the respiratory tract (e.g., nose and lungs) and include nasal congestion, frequent nosebleeds, shortness of breath, and cough that may produce bloody phlegm.
The diagnosis of GPA is based on clinical features affecting typical organ sites together with the identification of blood vessel and tissue inflammation in those organs. Because of this,  a biopsy is often necessary for confirmation of the  characteristic changes.
 
Due to overlap of imaging findings, some of these are misdiagnosed as malignancies. Before steroid treatment became available, mortality within one year was over 90%, with average survival being 5 months. Steroids prolonged average survival to 8 months. The introduction of cyclophosphamide (CYC) in the 1970s was a major breakthrough. Five-year survival is now 87%. Hence,  it is important  establish the diagnosis by imaging and histology

I have 18 years experience in radiology.

This should be added to discussion:

Prevalence of Wegener granulomatosis is about 3:100,000 and is more common in older patients.

Pulmonary nodules mostly tend to cavitate, leaving irregular thick walls, but rarely calcify. There may occasionally be reticulonodular interstitial thickening. It may involve small and medium pulmonary arteries. It may also lead to wedge-shape pulmonary lesions. Lymphadenopathy is visible in up to 15% of patients. 

I have seen previously.