Right upper lobe atelectasis in an adolescent with asthma

Upright frontal and lateral radiographs in 15-year-old with asthma and respiratory distress. The frontal view demonstrates a vague increase in right lung opacity. The right mediastinal border is indistinct, and the right hilum and diaphragm are elevated. On the lateral view, there is a retrosternal curvilinear shadow with increased opacity anteriorly. This represents marked anterior displacement of the major fissure, indicative of the upper lobe volume loss and right upper lobe atelectasis.