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A patient with an infiltrative mass lesion in the left upper lobe, being evaluated for malignancy. (a) The CT scan shows a left upper lobe mass (arrow) and an enlarged mediastinal node (arrowhead). (b) The corresponding transaxial PET scan. (c) The fusion image shows intense hypermetabolism, suspicious for a malignant tumor (arrow) and metastatic node (arrowhead). Subsequent biopsy showed Mycobacterium avium-intracellulare infection.
