Imaging methods for pulmonary sarcoidosis

Area of Science:

• Pulmonary Medicine
• Radiology
• Immunology

Background:

• Sarcoidosis is a chronic systemic granulomatous disease of unknown cause.
• Mediastinal and hilar lymph nodes are affected in over 90% of sarcoidosis cases.
• Pulmonary involvement is a hallmark of sarcoidosis.

Purpose of the Study:

• To review and discuss key chest imaging modalities for pulmonary sarcoidosis.
• To compare the diagnostic and monitoring capabilities of various imaging techniques.

Main Methods:

• Chest X-ray (CXR) for initial diagnosis and follow-up.
• High-resolution computed tomography (HRCT) for detailed lesion characterization.
• Fluorodeoxyglucose-positron emission tomography (FDG-PET) for assessing inflammatory activity.
• Magnetic resonance imaging (MRI) for cardiac sarcoidosis.
• Endobronchial ultrasound (EBUS) for basic diagnostics.

Main Results:

• Chest X-ray is the primary tool for diagnosis and monitoring sarcoidosis.
• HRCT provides detailed anatomical information on lesion location.
• FDG-PET demonstrates superior ability in identifying active inflammatory lesions compared to CXR and HRCT.
• MRI is valuable for diagnosing cardiac sarcoidosis.
• EBUS is essential for diagnosis but not for monitoring disease activity due to invasiveness.

Conclusions:

• A combination of imaging techniques is crucial for comprehensive sarcoidosis management.
• FDG-PET offers significant advantages in evaluating disease activity.
• The choice of imaging modality depends on the specific clinical question, from initial diagnosis to monitoring disease progression and assessing specific organ involvement.