Gallbladder stones are best imaged by simple abdominal ultrasound scanning

CT (computed Tomography) scanning

CT scanning will also pick up gallstones but will miss them in 10% of patients

MRCP (magnetic resonance cholangio-pancreatography)

MRCP is a non-evasive way of imaging gallbladder stones

Figure 1

MRCP showing a large stone in the gallbladder. Note the common bile duct is normal.

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Figure 2

MRCP showing a stone in the lower bile duct.

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EUS (Endoscopic ultrasound)

EUS is useful for diagnosing the presence of tiny gallbladder stones and gallbladder sludge often associated with undiagnosed right upper abdominal pain.