Discussion
Diagnosis With Brief Discussion
- Diagnosis
- ANCA-associated granulomatous vasculitis (Granulomatosis with polyangiitis)
- Radiologic Findings
- Chest radiograph shows multifocal consolidation with internal cavitation or cystic changes in the both lung fields.
Chest CT shows a multiple, thick and irregular walled, pulmonary nodules or consolidation with cavitation in both lungs.
The patient was underwent wedge biopsy and confirmed with ANCA-associated granulomatous vasculitis.
- Brief Review
- ANCA-associated vasculitis (Wegener granulomatosis) is an uncommon necrotizing vasculitis that classically manifests as a clinical triad consisting of upper and lower airway involvement and glomerulonephritis. Other less frequently involved organ systems include the central and peripheral nervous system and large joints. The diagnosis is based on a combination of clinical and laboratory findings. Because thoracic involvement often predominates, chest radiographic findings are often the first to suggest the diagnosis.
Pulmonary nodules and masses are the most common CT findings of ANCA-associated granulomatous vasculitis and are seen in up to 70% of patients. Waxing and waning of the single or multiple pulmonary nodules and masses with random distribution are features of the disease.
Central cavitation occurs in up to 50% of cases and is more common in nodules larger than 2 cm. Cavity walls may be smooth and thin or irregular and thick. CT halo sign (up to 15%) or reverse halo sign, radiating linear scarring, and pleural tags can be ancillary findings. Diffuse ground-glass opacity and consolidation (50%) may result from pulmonary hemorrhage or infection and bilateral perihilar and peribronchovascular distributions are the most common.
The tracheobronchial tree is the second most commonly affected area in the thorax (16-23% of cases) and subglottic portion of the trachea is most often common location. Segmental, focal, circumferential wall thickening involving the posterior membrane of the trachea is the typical radiologic findings. Pleural involvement (12-20% of the patient) causing pleural effusion and pleuritis and cardiac involvement as a form of pericarditis, coronary arteritis and myocardial ischemia owing to the vasculitis in small to medium-sized coronary artery could be also presented.
Although pathogenesis is unclear, the immunosuppression with corticosteroid and cyclophosphamide is the best current therapy (remission rate; 87%). In April 2011, the FDA approved rituximab (a chimeric antibody to CD20 protein) in combination with steroids to treat patients with ANCA-associated vasculitis, but relapse is still common.
- References
- 1. Martinex F, Jonathan H, Digumarthy S, et al. Common and uncommon manifestations of wegener granulomatosis at chest CT: Radiologic-pathologic correlation Radiographics 2012;32:51-69
2. Ananthakrishnan L, Sharma N, Kanne J, et al. Wegener granulomatosis in the Chest; High resolution CT findings.AJR 2009;192:676-682
3. Lohrmann C, Uhl M, Kotter E, et al. Pulmonary manifestations of wegener granulomatosis: CT findings in 57 patients and a review of the literature EJR 2005;53:471-477
- Keywords
- Lung, Vasculitis,