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Fig. 9B —57-year-old man with parenchymal actinomycosis manifesting as chronic necrotizing pneumonia with transfissural extension. Coronal reformation of contrast-enhanced CT image shows transfissural extension (arrow) of necrotic consolidation from superior segment of right lower lobe (large star) into upper lobe (small star). Note thickening of adjacent interlobar fissure (arrowheads).