Lung Metastases

Woodward Classification of Hematogenous Lung Metastases

  • Group 1: Lungs as First Site of Metastasis
  • Group 2: Metastasis to Lung After Seeding of Liver
  • Group 3: Simultaneous Seeding of Lung and Other Organs
  • Group 4: Metastasis to Bone (With Infrequent Lung Involvement)
    • Prostate Cancer (see Prostate Cancer, [[Prostate Cancer]])
    • Malignant Carcinoid Tumor Arising from Hindgut (see Carcinoid, [[Carcinoid]])
  • Group 5: Complicated Pattern of Metastasis to Bone (First Site: Lung, Liver, or Bone)


  • Radiologic Diagnosis of Extrathoracic Metastases to the Lung. Oncology (Williston Park). 1998 Mar;12(3):431-8; discussion 441-2, 444