Aspiration
Radiological manifestation will depend up on the type of aspiration.
Foreign body / Peanut / Coin
Partial obstruction
Complete obstruction / Atelectasis
Mineral oil
Lipoid pneumonia
Middle , lingula and lower lobes
Oropharyngeal bacteria
Gravity dependant segment
Superior segment of RLL and LLL
Axillary sub-segment of RUL anterior and posterior segments
Lung abscess
Gastric acid
ARDS