Primary Pulmonary Meningioma
摘要
Primary extraneuraxial meningiomas (PEMs) outside of the head and neck regions are extremely rare. To the best of our knowledge, fewer than 20 cases of PEMs of the thorax have been reported in the past 25 years. We report a case of PEM incidentally detected by chest radiography (CXR) and a computed tomographic (CT) scan of the chest, with an initial impression of mediastinal tumor. Thoracic exploration revealed an intrapulmonary mass 3 cm x 3 cm x 3 cm in dimension. The histologic picture was compatible with meningioma, and immunostaining showed a positive epithelial membrane antigen (EMA) and vimentin stain. No intracranial lesion could be found in the subsequent brain CT scan, nor could focal neurological signs be identified. We report this case as the first documented primary pulmonary meningioma in Taiwan.