"Unilateral hypertransradiancy is a term for the chest radiograph appearance of decreased attenuation affecting one hemithorax. Hypertranslucency is a term in common usuage which literally means ‘lets more light through’, but is inaccurate and refers to the darker part of the image which lets less light through!"
"contralateral pleural opacity, e.g. supine pleural effusion, pleural thickening or tumour, pneumonectomy"