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midline region of the lungs where bronchi, blood vessels, and nerves enter and exit the lungs
tapping on a surface to determine the difference in the density of the underlying structure
acute viral infection of infants and children with obstruction of the larynx, barking cough and stridor
chronic bronchial inflammatory disorder with airway obstruction due to bronchial edema and constriction and increased mucus production
acute inflammation and infection of alveoli, which fill with pus or products of the inflammatory reaction
infectious disease, lungs are usually involved, but any organ in the body may be affected
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