Abstract
BackgroundCholedochal or common bile duct (CBD) cysts are congenital cystic dilatation of any part of the bile ducts. It has been classified into five main types by Todani et al. Isolated cystic duct cysts are not included in this classification. It is extremely rare, and there are a limited number of cases in the literature.Case presentationA 34-year-old male patient was admitted to our hospital with right upper quadrant (RUQ) pain experienced intermittently for the past year. His medical history and laboratory findings were normal. Physical examination revealed tenderness in the RUQ. Abdominal ultrasonography shows that a thin, tubular, cystic lesion was associated with the CBD. On magnetic resonance imaging (MRI) and magnetic resonance cholangiopancreatography (MRCP), a saccular dilatation was observed in the middle part of the cystic duct. Isolated cystic duct dilatation was considered with current imaging findings. Laparoscopic cholecystectomy and cyst excision were performed. Surgery findings and histopathological examination of the excised cyst confirmed the diagnosis.ConclusionIsolated dilatations of the cystic duct are extremely rare, and familiarity with this anatomic variation and its early diagnosis can prevent complications such as inflammation and malignancy and guide the surgery. The most effective noninvasive imaging method in diagnosis is MRCP. Also, we recommend that it be classified as a new type with the name type VI biliary cyst, in addition to Todani classification.
Highlights
Choledochal or common bile duct (CBD) cysts are congenital cystic dilatation of any part of the bile ducts
The most effective noninvasive imaging method in diagnosis is magnetic resonance cholangiopancreatography (MRCP). We recommend that it be classified as a new type with the name type VI biliary cyst, in addition to Todani classification
We propose to present imaging findings of a type VI biliary cyst we detected in a case referred to us due to
Summary
Isolated dilatations of the cystic duct are extremely rare, and familiarity with this anatomic variation and its early diagnosis can prevent complications such as inflammation and malignancy and guide the surgery. The most effective noninvasive imaging method in diagnosis is MRCP. The patient reported in this article had signed a written informed consent form. This case report was a reporting of a case in a medical educational center, in which all patients are informed that they may be subjects of scientific experiments and are informed of the ethical codes of conducts. This study was in compliance to the latest version of the Helsinki Declaration. Consent for publication The patient had written and signed an informed consent note that the findings may be published without any personal detail. Competing interests The authors declare that they have no competing interests
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