Causes and investigation of increasing dyspnoea in rheumatoid arthritis.

Fibrosing alveolitis and bronchiolitis obliterans are two of the many pulmonary manifestations of the connective tissue disorders. When shortness of breath is the main complaint, it is often difficult to diagnose the individual causative lesion from the clinical examination, lung function tests, and chest radiographic findings. In such cases high resolution computed tomography, with its increased sensitivity and specificity for analysis of the pulmonary parenchyma, provides an excellent diagnostic tool for determining the presence and type of pulmonary abnormality.