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Fig. 10B —62-year-old woman with mucosa-associated lymphoid tissue lymphoma involving gallbladder. Subcostal conventional B-mode sonogram shows gallbladder wall thickening (arrow) up to 8 mm thick (asterisks) predominantly in fundal region. Unlike findings in gallbladder carcinoma, all wall layers of gallbladder are preserved. Differentiation from adenomyomatous hyperplasia can prove difficult and relies mainly on visualization of small cystic spaces (Rokitansky-Aschoff sinuses) and concretions apparent on sonograms and T2-weighted MR images.