Discoid atelectasis of the right middle lobe of the lung usually refers to discoid atelectasis of the right middle lobe of the lung due to endobronchial obstruction, which requires prompt medical attention upon detection. Discoidal atelectasis is usually described on imaging as a striated shadow in the middle of the lung field, with decreased translucency and increased uniformity of the atelectatic lung tissue, which may be less uniform in recovery or in the presence of bronchiectasis. Involvement of multiple lobes may result in the formation of multiple linear shadows, and in a few cases may extend to the pleura or beyond the interlobar fissures. Clinical examination with chest CT and fiberoptic bronchoscopy is usually required, especially fiberoptic bronchoscopy, which in most cases allows direct visualization of the obstructive lesion and biopsy. The presence of discoid opacities in the middle lobe of the right lung suggests prompt medical attention and treatment as prescribed by the doctor.