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The lumen of the posterior or posterolateral division of the bronchus to the lower lobe of the lung is normally quite small. This fact, combined with the dependent location of this bronchus and the angle at which junction is made with the main division of the lower lobe bronchus, impairs drainage from this portion of the lung and predisposes to infection. Abscess not infrequently occurs in this locality, and intermittent partial bronchial obstruction with varying degrees of infection is commonly encountered.
Recurring attacks of acute infection in the lower lobe of the lung almost always result from impaired drainage from this bronchus. Spontaneous drainage of the area of infection is followed by prompt recession of symptoms, but recurrence is frequent. Physical signs of localized pulmonary disease may be minimal or absent. If the lesion is located on the right side there may be roentgenographic evidence of pulmonary infiltration, but when
Toone EC, Vinson PP. INFLAMMATORY BRONCHIAL OBSTRUCTION WITH UNUSUAL CLINICAL MANIFESTATIONSREPORT OF A CASE. JAMA. 1954;155(12):1049–1050. doi:10.1001/jama.1954.73690300007005c
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