Presentation
Work up for abdominal pain.
Patient Data
Age: 35 years
Gender: Female
From the case:
Mercedes-benz sign of gallstone - MRI
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A 21 mm stone in the gallbladder adjacent to the neck shows a star-shaped pattern within, inferring the Mercedes-Benz sign.
A few small stones are also observed in the gallbladder fundus.
Case Discussion
Mercedes-Benz sign refers to the star-shaped gallstone fissures. Fissures are present in nearly 50% of gallstones and are usually fluid-filled and seen as high signal on T2W MR images. Less than half of these fissured gallstones contain some nitrogen gas observed lucent on x-ray and CT images.