What are the radiology findings in broncheictasis?

Linear atelectasis, dilated thickened airways, irregular peripheral opacities (mucopurulent plugs) CT (airway dilation (>1,5 times normal -> cylindrical bronchiectasis), signet-ring sign (cross-sectioned dilated air filled bronchus contiguous with smaller nodular opacity of pulmonary artery (looks like a ring with a stone), we see lack of tapering in combination with bronchial dilation (since dilation alone maybe asthma) Tree-in-bud pattern when small airways affected reflect aspiration/ infection persistent. Cysts seen in severe forms (Cystic bronchiectasis) clustered like grapes