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a Inflamed SDC exhibiting metaplastic changes and moderate chronic inflammation with germinal center formation (arrow) (×200). b Minor salivary gland lobule proximal to SDC exhibiting severe chronic obstructive sialadenitis (×20). c Chronic obstructive sialadenitis characterized by acinar atrophy, ductal dilatation, interstitial fibrosis, and interstitial chronic inflammation (×100). d Chronic obstructive sialadenitis exhibiting metaplasia of intralobular ductal epithelium (×200)
