 An interogative question asking by a professor to a student.The student gives precise and short answers without explaining to the professor's question. professor: Based on the following radiology report:
 There is stable, mild enlargement of the cardiac silhouette. Stable mediastinal silhouette. There are low lung volumes with bronchovascular crowding. Scattered XXXX opacities in the right lung base XXXX representing foci of subsegmental atelectasis with scattered airspace opacities in the medial left lower lobe. No pneumothorax. No pleural effusion. Degenerative changes of the thoracic spine possibly consistent with DISH.
1. Low lung volumes with mild cardiomegaly and scattered right basilar subsegmental atelectasis and scattered retrocardiac airspace opacities.
 In which body region is the airspace disease in the lung located? choose one or multiple body regions of the following options: 
 apex
left lower lobe
left upper lobe
middle lobe
pulmonary alveoli
right hilum
right lower lobe
right upper lobe
unspecified. You just have to answer with the correct options. If for example you have 'interstitial', 'right interstitial', and 'left interstitial' among the options, and right or left can not be exactly inferred from the report, then the correct option would be 'interstitial'. If you can´t find any corresponding body region, then answer with the option 'unspecified'.  Do not say the word "change" in the response
user