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Connective tissue disease-related pulmonary fibrosis showing straight-edge sign. (a) Coronal reformatted image in a 49-year-old woman with systemic sclerosis shows pulmonary fibrosis composed of reticulation and ground-glass opacity confined to lower lung zone with straight-edge (arrows) sign. (b) Coronal reformatted image in a 31-year-old Sjogren’s syndrome demonstrates reticulation and honeycombing in lower lung zones with straight-edge (arrows) sign.
