We describe FDG PET/CT findings in a case of lung adenocarcinoma with diffuse cavitary intrapulmonary metastases at initial diagnosis. High-resolution CT of the chest showed the primary solid tumor in the right upper lobe and numerous cavitating metastases ranging from a few millimeters to 1 cm in the bilateral lungs. FDG PET/CT showed intense activity of the primary tumor, diffuse activity of the lung metastases, and hypermetabolic metastases in the mediastinal lymph nodes and bones. Familiarity with this atypical intrapulmonary metastatic pattern of lung cancer may be helpful for the diagnosis and differential diagno sis.
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