Primary pulmonary meningioma: A case report and review of the literature

Figure 1 Contrast-enhanced chest computed tomography images of (A, B) unenhanced and (C) enhanced scan. A 6.9-cm diameter well-circumscribed mass in the left lower lobe of the lung shows mild homogeneous enhancement.

Figure 2 Positive uptake by the mass on ¹⁸F-fluorodeoxyglucose-positron emission tomography suggesting malignancy.

Figure 3 The transbronchial biopsy result: Hematoxylin and eosin staining showed that a few nested epithelioid cells and abnormal cells were observed in the tissue (200×).

Figure 4 Histological features of primary pulmonary meningioma. A-D: Macroscopically, primary pulmonary meningioma (PPM) showed as spindle or oval cells organized in bundles and whorls on hematoxylin-eosin staining (25×; 50×; 100×; 200×); E-H: Immunohistochemically (200×), PPM showed negativity for E: Cytokeratin, positive for F: Epithelial membrane antigen; G: Progesterone receptor; H: Somatostatin Receptor 2 (SSTR2).