A case of primary pulmonary meningioma

Abstract

We report a rare case of primary pulmonary meningioma. A 68-year-old man was referred to our hospital because of a nodule in the left lung detected by chest-radiograph. CT showed a 12×10-mm round tumor in the left S9. Because this nodule grew gradually during an about one-year follow-up, we decided to resect it. We performed wedge resection of the left lower lobe by three-port complete VATS. Histological examination revealed that the tumor has broad sheets or medium-sized lobules of fairly uniform cells with round or oval nuclei, abundant light-pink cytoplasm, and indistinct cytoplasmic borders. Immunohistochemical staining showed negative results for EMA, CD34, and S-100, and a positive results for Vimentin. We diagnosed this patient with a primary pulmonary meningioma because neither brain nor spinal cord MRI detected a neoplastic lesion.