Atypical primary pulmonary meningioma: a report of a case suspected of being a lung metastasis

Abstract

Primary extracranial and extraspinal meningiomas are very rare tumours, and primary pulmonary ones are even more uncommon. They present as a solitary pulmonary nodule, and most of them are benign, except for three cases. We describe a primitive atypical pulmonary meningioma first suspected of being a metastasis in a patient during follow-up ten years after therapy for breast cancer.

Keywords: atypical meningioma; lung metastasis; meningioma.

Figure 1.. FDG-PET showing the pulmonary lesion in the upper lobe (a) transaxial low dose CT image, with midly increased metabolism (b) transaxial PET image, fused transaxial section and maximum intensity projection image (c and d).

Figure 2.. (a) Meningotheliod feature constituted by whorl of spindle cells. (H&E 20×). (b) Microcystic feature of small cells, with a clear cytoplasm (H&E 20×). (c) Atypical mitosis in a spindle cell area of meningioma typically observed in atypical meningioma of CNS (H&E 40×).