Round pneumonia refers to a rounded region of consolidative parenchymal pulmonary infection, usually identified in children. The most commonly proposed theory is due to absence of collateral air communicating pathways in children (i.e. pores of Kohn, canals of Lambert) which limit spread of infection. On a CXR,the region appears as a rounded lung opacity with well formed borders. It is most commonly seen in the superior segments of lower lobes. Air-bronchograms may be seen, but are often absent.
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