الفهرس 
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Abstract
Summary RA is a collagen vascular disease commonly associated with extra-articular manifestations. Pulmonary involvement is considered one of the most common extra-articular manifestations associated with RA. Pulmonary involvement in cases of RA may take one of the following forms: pleural disease, ILD, airway disease, rheumatoid nodules, and pulmonary vascular disease. HRCT is currently the imaging modality of choice in diagnosis of thoracic manifestations of RA being superior to chest radiography and PFTs in demonstrating the presence and extent of lung abnormalities. Our study involved reviewing the HRCT results of 60 known RA patients which were referred to the radiology department of Menoufia university hospital and Shbein Elkom teaching hospital. Using HRCT findings we were able to detect the forms of pulmonary involvement in these patients which mainly took 2 forms: either airway disease in the form of hyperinflation (82%), bronchiectasis (55%), mosaic perfusion (45%), and bronchial wall thickening (91%) or ILD in the form of GGO (91%), reticulations (73%), and cysts (18%). Also, we could detect the pattern of ILD such as NSIP or LIP using HRCT.
HRCT findings showed signs of ILD in 27 cases (45%), air-way