Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior studies , lung volumes are lower , causing crowding of bronchovascular structures . Thickening of the pulmonary fissures suggests diffuse mild edema or severe bronchial constriction . This can be confounded by the low lung volumes . The heart size , mediastinal , and hilar contours are normal . The lungs are otherwise clear without pleural effusion , focal consolidation , or pneumothorax .
    OUTPUT:
    
Thickening of the pulmonary fissures suggest diffuse mild edema or bronchial irritation . Lower lung volumes can cause crowding of bronchovascular structures .