Multimodality Imaging of Focal and Diffuse Fibrosing Mediastinitis

Area of Science:

• Radiology
• Pathology
• Immunology

Background:

• Fibrosing mediastinitis is a rare, benign, yet life-threatening condition characterized by fibrotic tissue proliferation within the mediastinum.
• It presents in focal and diffuse subtypes, with distinct etiologies and patient demographics.
• Both subtypes cause symptoms due to compression of vital mediastinal structures.

Purpose of the Study:

• To describe the clinical presentation, imaging features, and diagnostic considerations for fibrosing mediastinitis.
• To emphasize the importance of imaging in diagnosis, disease assessment, and treatment evaluation.
• To differentiate fibrosing mediastinitis from malignancy.

Main Methods:

• Review of clinical presentations and symptoms associated with fibrosing mediastinitis.
• Analysis of characteristic imaging features, including infiltrative mediastinal soft tissue, calcification, and compression of mediastinal structures.
• Correlation of imaging findings with clinical context for diagnosis.

Main Results:

• Focal fibrosing mediastinitis is often linked to Histoplasma capsulatum infection and affects younger individuals.
• Diffuse fibrosing mediastinitis can be idiopathic or autoimmune, typically affecting older males.
• Characteristic imaging findings include infiltrative mediastinal soft tissue causing compression or obstruction of vascular structures and the aerodigestive tract.

Conclusions:

• Characteristic imaging findings, in the appropriate clinical setting, allow for the suggestion of fibrosing mediastinitis diagnosis.
• Careful imaging assessment is crucial for excluding malignancy, monitoring disease progression, identifying complications, and evaluating treatment response.
• Individualized treatment strategies are necessary, tailored to alleviate the compression of affected mediastinal structures.