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Fatty mediastinal mass:
mediastinal lipomatosis, hernia, lipoma, liposarcoma, thymolipoma, teratoma
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Densely enhancing mediastinal mass:
vascular, hypervascular tumors, goiters, Castleman�s
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Cardiophrenic angle mass:
pericardial cyst, Morgagni hernia, lymphoma, mets, lung CA, fat pad (most common)
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Cyst:
traumatic cyst, hematoma cyst, bronchogenic cyst, hydatid cyst, emphysematous bullae, bronchiectasis, end-stage interstitial disease, sequestration, CAM, pneumatocele;
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small cystic dz
EG, LAM, cystic PCP, honeycombing, emphysema
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Cavity:
pyogenic abscess (Staph, Klebsiella, E coli, Pseudomonas, anaerobes), lung CA (usu sq cell), TB, fungus (blasto, cocci, histo), Nocardia, secondary Aspergillus infection of cavity, septic emboli (Staph aureus), mets (usu sq cell), lymphoma (Hodgkin's), rheumatoid nodule, Wegener's, large hiatal hernia, silicosis, lymphomatoid granulomatosis, parasites
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Air crescent sign in cavity:
Aspergillus, Mucor, Actinomycosis, septic emboli, Klebsiella, TB, tumors (KS)
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