Abstract
Background. Most meningiomas primarily occur in the central nervous system, but it seldom originates in other organs. In the present study we encountered a case of primary pulmonary meningioma and the results are reported. Case. In a 68-year-old woman, an abnormal shadow in the chest area was pointed out 4 years previously by physical examination. According to CT examination, 3 small nodules with a maximum size of 12 mm were found in the right S5. A biopsy was performed under bronchoscopy, but no malignancy was detected. There were no changes in the shadow in the CT examination after 4 months and subsequently we decided to observe the courses based on physical examinations. In the current physical examination, a precise chest examination was recommended and the patient received an examination at our clinic. According to CT examination, the aforementioned shadow had enlarged to 20 mm, further the number of nodules increased and 6 nodules were found in both lungs. A CT-guided needle biopsy was performed for the nodules with the largest diameter. Histologically and immunohistochemically, it was diagnosed as a meningioma. According to the CT examination, no tumor was found in the head area so that it was diagnosed as a primary pulmonary meningioma. Conclusion. We encountered a primary pulmonary meningioma showing a trend towards multiple occurrence and enlargement. A primary pulmonary meningioma is very rare. We investigated reported case in Japan to discuss clarifying histogenesis.
