Organizing pneumonia

Organizing pneumonia is a non-specific pathologic pattern of response to lung damage. It can be idiopathic, or it can occur secondary to various medical processes, most commonly infections, connective tissue disease, and pharmacological toxicity. Although there is no strict definition of the radiological pattern of organizing pneumonia as in other idiopathic interstitial pneumonias, the characteristic pattern of this disease could be considered to include patchy consolidations and ground-glass opacities in the peribronchial and subpleural areas of both lungs. Moreover, follow-up examinations show that these lesions respond to treatment with corticoids, migrate with or without treatment, and tend to recur when treatment is decreased or withdrawn. Other manifestations of organizing pneumonia include nodules of different sizes and shapes, solitary masses, nodules with the reversed halo sign, a perilobular pattern, and parenchymal bands. (c) 2022 SERAM. Published by Elsevier Espana, S.L.U. All rights reserved.