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Connective tissue disease-related pulmonary fibrosis showing anterior upper lobe sign in a 65-year-old woman with rheumatoid arthritis. (a) Lung window image of CT scan obtained at level of aortic arch demonstrates large area of honeycombing (arrows) in anterior aspects of both upper lobes. (b) Sagittal reformatted image discloses reticular lesions in anterior upper lobe (arrows) in left side. Also note reticular lesions in subpleural areas (arrowheads) of left lower lung zones.
