Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal with and without change . Small calcified right upper lobe nodules appear unchanged . A diffuse , subtle micronodular pattern also appears unchanged but is not fully characterized radiologically . There are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Subtle micronodular pattern , which is not fully characterized by conventional chest radiographs . Dedicated chest CT may be helpful to better characterize these findings , and to help differentiate granulomatous processes ( sarcoidosis , prior granulomatous exposure ) from indolent infection as well as the unlikely possibility of slowly growing miliary metastases .