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Microscopic image of main gallbladder (a), accessory gallbladders ((b), (c)), and tubular adenocarcinoma in the accessory gallbladder (d). Lobular hyperplasia or adenosis was observed in the accessory gallbladder, but the basic structure of gallbladder (mucosal layer, muscular layer, and submucosal layer) could be seen in both gallbladders. Tubular adenocarcinoma infiltrating into the submucosal layer could be confirmed.
