Round Pneumonia

  • Etiology: Streptococcus pneumoniae
  • Imaging: due to absence / poor development of collateral airways, inflammation spreads centrifugally giving round appearance, in posterior lower lobes
  • (Collateral airways allow ventilation of alveoli through the channels bypassing the normal airway but are poorly developed in infants)
  • (Channels of Lambert, pores of Khan for intralobular collateral circulation, Pathway of Martin for interlobular circulation)
  • Clinical: < 8 years old

Cases of Round Pneumonia