Incidental Metaplastic Primary Pulmonary Meningioma

Area of Science:

• Oncology
• Pathology
• Pulmonology

Background:

• Primary pulmonary meningioma is a rare, benign tumor.
• It often presents as a solitary pulmonary nodule, mimicking lung cancer or metastases.
• Misinterpretation on imaging studies is common.

Purpose of the Study:

• To report a rare case of primary pulmonary meningioma.
• To describe a unique subtype with mesenchymal differentiation.
• To increase awareness of this rare lung tumor.

Main Methods:

• Case presentation of a 54-year-old female patient.
• Review of imaging studies.
• Histopathological diagnosis following surgical resection.

Main Results:

• An incidentally discovered solitary lung nodule was diagnosed as metaplastic primary pulmonary meningioma.
• The tumor exhibited focal or global mesenchymal differentiation.
• This represents the first reported case of primary pulmonary meningioma with mesenchymal differentiation in English literature.

Conclusions:

• Metaplastic primary pulmonary meningioma is a rare WHO grade 1 meningioma subtype.
• This case expands the understanding of pulmonary meningioma variations.
• Early recognition and accurate diagnosis are crucial for appropriate patient management.