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Published on: November 4, 2015
Thin-walled ring shadows in early pulmonary sarcoidosis
Abstract:
The appearance of ring shadows on the chest radiograph of patients with sarcoidosis is usually associated with generalised, irreversible pulmonary fibrosis. We report three patients in whom thin-walled ring shadows appeared early in the disease. These ring shadows occurred in areas of pre-existing lung shadowing and in two patients they disappeared with corticosteroid therapy over a period of 1-2 years. We postulate that these early sarcoid ring shadows may be caused by a combination of central necrosis of areas of coalescent granulomas and a check-valve mechanism beyond partial obstruction of airways by endobronchial sarcoidosis.
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