WAbdominal ultrasonography
WCholangiography
WCholescintigraphy
WDefecography
WDouble-contrast barium enema
WEndoscopic ultrasound
WLower gastrointestinal series
WMagnetic resonance cholangiopancreatography
WPercutaneous transhepatic cholangiography
WSialography
WTransrectal ultrasonography
WUpper gastrointestinal series
WVirtual colonoscopy