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a SDC with prominent undulating lining representing collapse of previously distended cyst; true papillae with fibrovascular cores are not seen. b Collapsed ‘papillary oncocytic cystadenoma-like’ SDC with undulating cyst lining and uniform oncocytic metaplasia, but no papillae. c, d ‘Warthin tumor-like’ SDC with undulating cyst lining, uniform oncocytic metaplasia, and prominent lymphoplasmacytic inflammatory infiltrate subjacent to cyst lining
