Pulmonary Sarcoidosis: Imaging and Diagnostic Limitations

Area of Science:

• Pulmonary Medicine
• Radiology
• Granulomatous Diseases

Background:

• Pulmonary sarcoidosis is a complex multisystem granulomatous disease with diverse lung manifestations.
• Radiological and clinical differentiation is complicated by its heterogeneous presentation, ranging from reversible lymphadenopathy to irreversible fibrosis.

Purpose of the Study:

• To review typical radiological patterns of pulmonary sarcoidosis.
• To evaluate diagnostic modalities for sarcoidosis.
• To emphasize the prognostic and therapeutic importance of distinguishing reversible from irreversible lung lesions.

Main Methods:

• Comprehensive literature search of recent publications and guidelines.
• Focus on imaging techniques (chest radiography, CT, MRI, PET) and clinical correlations.
• Emphasis on Scadding criteria for staging and CT for detailed characterization.

Main Results:

• Chest radiography offers cost-effective staging but has limitations; CT is the most precise modality, revealing characteristic features like hilar lymphadenopathy and nodules.
• Advanced CT findings include fibrotic remodeling, traction bronchiectasis, and honeycombing.
• MRI is primarily for cardiac sarcoidosis, while PET aids in assessing inflammatory activity and monitoring therapy.

Conclusions:

• Pulmonary sarcoidosis necessitates a multimodal diagnostic approach, with CT playing a central role in staging and prognosis.
• Differentiating reversible inflammatory changes from irreversible fibrotic lesions is critical for guiding therapeutic decisions.
• An interdisciplinary approach is essential for differential diagnosis from other granulomatous, infectious, and neoplastic conditions.