[Diffuse Pulmonary Meningotheliomatosis Needed to be Differentiate from Metastatic Lung Tumor:Report of a Case].

A 77-year-old woman was found to have multiple granular shadows in the bilateral lungs and a right mammary mass on chest computed tomography (CT) scan for preoperative check of colorectal cancer. The right mammary mass was diagnosed as breast cancer as a result of vacuum-assisted breast biopsy. Fluorodeoxyglucose-positron emission tomography( FDG-PET) showed no abnormal uptake in the lung fields. Since a transbronchial lung biopsy did not establish a diagnosis, an incisional biopsy was performed via a thoracoscopic approach. The histology of the pulmonary nodules revealed minute pulmonary meningothelial-like nodules (MPMNs) and the patient was diagnosed with diffuse pulmonary meningotheliomatosis (DPM). When multiple pulmonary nodules are found in patients with coexisting malignancy, DPM should be considered in addition to metastatic lung tumors.