Radiographic Exhibit

Type II Choledochal Cyst: Ultrasonographic Appearance 1 Carlisle L. Morgan, Ph.D., M.D.2, William S. Trought, M.D., Terrence A. Oddson, M.D., and William M. Thompson, M.D.2 The ultrasonic findings in a rare Type II choledochal cyst are described. In patients with a right upper quadrant mass In whom the clinical, ultrasonic, or radiographic findings are atypical for other etiologies, this diagnosis should be considered. INDEX TERMS:

Bile ducts, cysts' Bile ducts, ultrasound studies

Radiology 132:130, July 1979

cyst is a rare anomaly most commonly diagnosed during childhood but often not detected until later in life. Three types of choledochal cysts have been described (1). Type I, the overwhelming majority of cases, is a localized dilatation of the distal common bile duct. Type II is a congenital diverticulum of the common bile duct usually protruding from the lateral wall of the duct; the remainder of the biliary tree is normal. Type III, or choledochocele, is a herniation of the common bile duct into the duodenum. The authors describe the ultrasonic findings in a rare Type II choledochal cyst.

C

HOLEDOCHAL

Fig. 1. Longitudinal ultrasonic scan 4 cm to the right of the midline, showing a cystic mass (C) caudal to the right lobe of the liver (L) . The mass is also anterior to and separate from the right kidney (I