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Fig. 1A. —Intrapulmonary bronchogenic cyst in 37-year-old woman. High-resolution CT scan (1-mm collimation, mediastinal window setting) obtained at level of aortic arch shows well-defined homogeneous 48-mm soft-tissue lesion in left upper lobe with attenuation of 40 H. Enhanced scan (not shown) showed no changes in attenuation.