Densities in the lung fields seen on CXR can be lumped into 4 broad categories - mnemonic AVID: Alveolar, Vascular, Interstitial, and Damage. Vascular markings are self explanatory. Damage = anything that causes cavities / abscesses and has its own differential (Clinical Microbiology Reviews, April 2008). Alveolar infiltrates can be pus, fluid, protein, or cells. One CXR to remember the appearance of is bronchoalveolar cell carcinoma. It can present as pulmonary infiltrates that mimic pneumonia. As for the alphabet soup of ILD - a nice review can be found here. (MD Consult login or on campus access required).
One thing that is new on my radar - eosinophilic pneumonia and chronic pneumonitis induced by daptomycin therapy. This was reported in the 1 March 2010 issue of Clinical Infectious Diseases and cases have been previously reported elsewhere, but this is the first time I have noticed it.
Review of topics covered in morning report, M&m, and core conferences with links to supplemental reading material.
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