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Introduction
IgG4‐related disease is characterized by IgG4‐positive plasmacyte infiltration into various organs, but its etiology is not unknown.
Objectives
To elucidate the etiology of IgG4‐related disease.
Methods
We experienced an interesting case of IgG4‐related lung disease complicated by chronic EB virus infection.
Results
A 70‐year‐old male visited our hospital due to failure of pneumonia...