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NSIP to UIP Progression in Mixed Connective Tissue Disease

Imaging findings

Progressive fibrotic interstitial lung disease starting with a pattern typical of NSIP (2013) that evolved into a pathologically proven UIP pattern (2017) over four years.

Key takeaways

UIP is a pattern of injury rather than a single disease. In the context of autoimmune diseases, NSIP can slowly progress to a UIP pattern. Early imaging is critical for understanding the evolution of fibrotic disease.

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