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Post surfactant therapy changes. (A) Extensive bilateral opacities and air bronchograms (arrows) prior to initiation of surfactant treatment. (B) Increased lung volumes with clearing of pulmonary opacities bilaterally. (C) Asymmetric surfactant response with clearing of left lung and expanded left lung volume in a different patient. Persistent granular opacities (asterisk) are seen involving right lung with air bronchograms (arrows)
