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Imaging of choledochal cysts.

Vanessa A Lewis1, Sharon Z Adam, Paul Nikolaidis

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Summary

Choledochal cysts are rare biliary tree dilatations. Magnetic resonance cholangiopancreatography (MRCP) is the gold standard for diagnosis, aiding in surgical planning and identifying associated risks.

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Area of Science:

  • Radiology
  • Gastroenterology
  • Pediatric Surgery

Background:

  • Choledochal cysts are rare cystic dilatations of the biliary tree.
  • Their etiology is unknown, with debate on congenital versus acquired origins.
  • They can be misdiagnosed as other cystic lesions if not recognized.

Purpose of the Study:

  • To review the imaging features of choledochal cysts using the Todani classification.
  • To familiarize radiologists with diagnostic modalities for choledochal cysts.
  • To highlight the importance of accurate diagnosis for managing complications and surgical planning.

Main Methods:

  • Review of multiple imaging modalities including ultrasound, CT, MRCP, ERCP, and PTC.
  • Emphasis on Magnetic Resonance Cholangiopancreatography (MRCP) as the current gold standard.
  • Assessment for abnormal pancreaticobiliary junction, frequently associated with choledochal cysts.

Main Results:

  • MRCP has become the preferred diagnostic tool, surpassing more invasive methods.
  • MRCP effectively detects the abnormal pancreaticobiliary junction.
  • Accurate diagnosis and assessment of lesion extent are crucial for surgical intervention.

Conclusions:

  • Radiologists must recognize characteristic features to avoid misdiagnosis of choledochal cysts.
  • MRCP is essential for diagnosis, characterizing cyst type, and surgical planning.
  • Early and accurate diagnosis mitigates risks of serious complications like cholangitis and malignancy.