Metastatic (secondary) pulmonary meningioma; Primary pulmonary meningioma (PPM)
Meningiomas are commonly known as neoplasms of the neural axis. They are derived from the arachnoidal (meningothelial) cells of the leptomeninges, and extremely rare of the entrapped arachnoid cells in the tela choroidea and choroid plexuses, intraventricular structures. In the absence of lesions of the neural axis, meningothelial proliferations have been described in numerous extraneural locations: the lung, pleura, and mediastinum, abdomen and liver, lymph nodes, skull and other bones, the skin, middle ear, paranasal sinuses, salivary glands, retroperitoneum, soft tissue, and orbit. Of these, the lung is the most common site for primary or secondary (metastatic) meningothelial neoplastic proliferations (60%) (Estanislau et al. 2009).
Although extremely rare, metastatic pulmonary meningiomas seem to be significantly more frequently encountered compared to primary pulmonary meningiomas...
References and Further Reading
- Louis, D. N., Ohgaki, H., Wiestler, O. D., et al. (2007). WHO Classification of tumors of the central nervous system (4th ed.). Lyon (France): IARC.Google Scholar