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Figure 36b.  Focal adenomyomatous hyperplasia (adenomyoma) in a 35-year-old man who was evaluated for intermittent abdominal pain. (a) Longitudinal US image of the gallbladder fundus shows an ill-defined mass. There is edge shadowing and reverberation artifact emanating from the mass. (b) Photograph of the opened resected gallbladder shows the bivalved fundal mass (arrows), which contains multiple cystic spaces, and a hemorrhagic mucosa.