atelectasis vs. pneumonia

incomplete expansion of the lungs at birth, as from lack of breathing force.

collapse of the lungs, as from bronchial obstruction.

inflammation of the lungs with congestion.

Also called lobar pneumonia. an acute disease of the lungs, caused by the bacterium Streptococcus pneumoniae and characterized by fever, a cough with blood-tinged phlegm, and difficult breathing.