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Usual interstitial pneumonia.
Usual interstitial pneumonia (UIP) is a distinct histological lesion observed in idiopathic pulmonary fibrosis (IPF), but can be found in other etiologies. The diagnosis of UIP can be established by surgical lung biopsy or by high resolution thin section computed tomographic scans (provided the radiographic features are classical). Historically, patients labeled as "IPF'' encompassed a group of disorders including UIP as well as other idiopathic interstitial pneumonias, which differ from UIP in prognosis and responsiveness to therapy. Current recommendations from international consensus statements restrict the term IPF to patients with idiopathic UIP. The inciting cause(s) and pathogenesis of UIP have not been elucidated, but alveolar epithelial cell injury and dysregulation or altered phenotypic expression of fibroblasts are key elements. Inflammatory cells may play minor roles in initiating or propagating the fibrotic process. The prognosis of UIP is poor. Mean survival following diagnosis approximates 3 years. Current therapies are of unproven value. Corticosteroids or immunosuppressive agents have been most often used, but data affirming benefit are lacking. Single-lung transplantation is a viable option for patients failing medical therapy. Novel therapeutic strategies based upon inhibiting fibroproliferation or enhancing alveolar reepithelialization are desperately needed. In this article, we discuss diagnostic criteria for UIP (both histopathological and radiographic), natural history and clinical course, and therapeutic approaches (both current and future).
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