LC occurs as a result of the initial hematogenous spread of tumor to the lungs, with subsequent malignant invasion through the vessel wall into the pulmonary interstitium and lymphatics. Tumor then proliferates and easily spreads through these low-resistance channels. Less commonly, direct infiltration occurs as a result of contiguous mediastinal or hilar lymphadenopathy or an adjacent primary bronchogenic carcinoma.
On radiographs, LC appears as reticular or reticulonodular opacification, often with associated septal lines (Kerley A and B lines), peribronchial cuffing, pleural effusions, and mediastinal and/or hilar lymphadenopathy (20-50% of cases).
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