PMID: 14400415May 1, 1960Paper

Lobar pneumonia. The distribution of sites in infants and children

California Medicine
J HEALD, W COULSON

Abstract

In a review of roentgenograms of 228 pediatric patients with segmental pneumonia, the left upper lobe was observed to be involved in only 4 per cent of cases. The right upper lobe was involved most frequently-over eight times as often as the left upper lobe and twice as often as the right middle or lower lobe. It is suggested that this distribution is related to the fact that the angle of the left bronchus in relation to the median plane is more acute than the angle of the right bronchus, the sharper angle perhaps serving as protection against aspiration.

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