Infection

Question 1

Multiple Ill-defined nodules

Answer 1

• Infection:
  
  • Mycobacterium
  • Fungal
  • Bacterial
  • Septic emboli
• Malignancy:
  
  • Metastatic (hemorrhagic)
  • Bronchoalvoelar carcinoma
  • Lymphoma
  • Kaposi sarcoma (rare)
• Inflammatory:
  
  • Hypersensitivity pneumonitis
  • Wegeners
  • LCH
  • Sarcoidosis
  • Rheumatoid nodules
• Pneumoconiosis: silicosis/coal worker

Question 2

Calcification/ossification

Answer 2

• Healed infection: TB, MAC, histoplasmosis, varicella
• Pneumoconiosis: silicosis, coal worker
• Sarcoidosis
• Malignancy:
  
  • Metastasis: thyoid, synovial, mucinous adenocarcinoma, treated lymphoma/mets
  • Lung neoplasm: cancer, carcinoid, harmatoma
• Metastatic calcinosis: renal failure/hyperPTH
• Amyloid

Question 3

Upper lung zone predominant disease

Answer 3

• TB
• Sarcoidosis
• Silicosis
• Hypersentitivty pneumonitis
• Centrilobular emphysema
• LCH (except children)
• ABPA
• NEurogenic pulmonary oedema
• Chronic eosinophilic pneumonia

Question 4

High attenuaton mass, mediastinum, hilum

Answer 4

• Calcified lymphadenopathy: TB, histioplasmosis, pneumoncysitis, medastinal fibrosis
• Goiter
• Aneruysm
• Hematoma
• Pneumoniosis
• Neoplasm: treated lymphoma, thymomoa, teratoma, mets, castleman disease
• Amyloid
• forgut cyst
• Hemangioma