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In bronchogenic carcinoma you are more likely to see a discrete mass, with atelectasis/collapse distally.

The most common types are squamous cell carcinoma (30-40%) and adenocarcinoma (also 30-40%). Squamous cell is more likely to be a central discrete lesion with cavitation, while adenocarcinoma is more often peripheral and almost never cavitates.1

In pneumonia (lobar) you may see more diffuse consolidation throughout the lobe +/- some collapse.

Reference

  1. http://emedicine.medscape.com/article/358433-overview

IMAGES- Please see this excellent radiological resource:

  • Bronchogenic carcinomahttp://www.mypacs.net/cgi-bin/repos/mpv3_repo/wrm/repo-view.pl?cx_subject=20740593&cx_repo=mpv4_repo&from_hss=1
  • pneumoniahttp://www.mypacs.net/cgi-bin/repos/mpv3_repo/wrm/repo-view.pl?cx_subject=11615116&cx_repo=mpv4_repo&from_hss=1
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Q: Radiological difference between pneumonia and bronchogenic carcinoma?
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