High-Resolution CT Scan Fibrotic Patterns in Stage IV Pulmonary Sarcoidosis: Impact on Pulmonary Function and...

Area of Science:

• Pulmonary Medicine
• Radiology
• Fibrotic Interstitial Lung Diseases

Background:

• High-resolution CT scan (HRCT) fibrosis patterns correlate with survival in some interstitial lung diseases.
• The prognostic significance of HRCT findings in sarcoidosis remains largely unknown.

Purpose of the Study:

• To investigate the impact of HRCT-identified fibrosis extent and patterns on pulmonary function and survival in stage IV pulmonary sarcoidosis.

Main Methods:

• Retrospective analysis of HRCT scans from 240 stage IV sarcoidosis patients.
• Assessment of fibrosis extent, bronchiectasis, fibrocystic changes, honeycombing, GGOs, bullae, and mycetomas.
• Correlation with pulmonary function tests, sarcoidosis-associated pulmonary hypertension (SAPH), and patient survival.

Main Results:

• Extensive fibrosis (>20%) was linked to more severe pulmonary impairment, higher SAPH rates (53%), and worse survival (44% mortality).
• Basal subpleural honeycombing was associated with the worst pulmonary function and highest mortality (55%).
• Independent predictors of reduced survival included basal subpleural honeycombing, low diffusion capacity for carbon monoxide, and White race.

Conclusions:

• HRCT findings are crucial for predicting pulmonary function and survival in fibrotic sarcoidosis.
• Extensive fibrosis (>20%) and basal subpleural honeycombing are significant indicators of poor prognosis in stage IV pulmonary sarcoidosis.