Histopathological features (H&E staining). A: Preservation of the lobular architecture (25×) (continuous arrow). B: Atrophic broken acini with leakage of mucus and ductal dilatation (100×) (continuous arrow). C: Ducts showing squamous metaplasia (continuous arrow) and a moderate stromal mononuclear inflammatory infiltrate (dotted arrow) (200×). D: The same aspects as shown in B and C at 400× magnification.