[Lung Metastases from Pancreatic Cancer Initially Suspected to be Primary Lung Cancer due to Lepidic Tumor Growth].

A 46-year-old patient man was pointed out multiple abnormal shadows on the chest X-ray. Computed tomography( CT) scans showed diffuse multiple granular shadows associated with ground-glass opacity in the surrounding area. Therefore, sarcoidosis or inflammatory lung disease was suspected. Bronchoscopic examination could not establish definitive diagnosis. Since an increase in the size and number of granular shadows was observed during the follow-up period, surgical biopsy was performed. Pathologically, adenocarcinoma with lepidic tumor growth into the surrounding area was observed suggesting primary lung cancer. Positron emission tomography (PET) after surgery for establishing stage of disease detected an abnormal accumulation in the pancreatic head which was demonstrated to be pancreatic cancer by biopsy. The final diagnosis of multiple lung tumor was metastases from pancreatic cancer.