|Year : 2019 | Volume
| Issue : 3 | Page : 256-258
High insertion of cystic duct at the gallbladder fundus: An undescribed anomaly!
Gabriel Rodrigues, Shruti Rahul Pandit, Afroz Khan, Bharath Veerabharappa, Balaji Jayasankar, Rasagna Anaparti
Department of General Surgery, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, India
|Date of Submission||07-Aug-2018|
|Date of Acceptance||01-Oct-2018|
|Date of Web Publication||4-Jun-2019|
Kasturba Medical College, Manipal Academy of Higher Education, Manipal - 576 104, Karnataka
Source of Support: None, Conflict of Interest: None
The anatomy of the biliary tree is complex, and its variations of both intra- and extra-hepatic bile ducts can be found in approximately 30% of the general population. These variations are not picked up on routine pre-operative investigations of patients planned for a laparoscopic cholecystectomy (LC) and often present as an unusual 'surprise' and a challenge that can make dissection in the Calot's triangle difficult leading to iatrogenic injury. We present a case of a 53-year-old female with an undescribed anomaly encountered during an LC. There was a high insertion of the cystic duct into the fundus of the gallbladder. No such anomaly has been described in literature till date.
Keywords: Anatomy, Calot's triangle, cholecystectomy, cystic duct, laparoscopy
|How to cite this article:|
Rodrigues G, Pandit SR, Khan A, Veerabharappa B, Jayasankar B, Anaparti R. High insertion of cystic duct at the gallbladder fundus: An undescribed anomaly!. J Min Access Surg 2019;15:256-8
|How to cite this URL:|
Rodrigues G, Pandit SR, Khan A, Veerabharappa B, Jayasankar B, Anaparti R. High insertion of cystic duct at the gallbladder fundus: An undescribed anomaly!. J Min Access Surg [serial online] 2019 [cited 2020 Jan 18];15:256-8. Available from: http://www.journalofmas.com/text.asp?2019/15/3/256/245147
| ¤ Introduction|| |
Anatomical variations of the biliary tree occur in approximately 30% of general population and are the most common cause of iatrogenic bile duct injury during a laparoscopic cholecystectomy (LC). Ultrasonogram (USG) of the abdomen is the routinely done radiological investigation for a patient presenting with symptomatic gallstone disease and cannot routinely pick up the subtle anatomical variations of the biliary tree. Hence, these variations are commonly encountered as a surprise during a laparoscopic surgery.
Several variations of the cystic duct anatomy have been described: cystic duct insertion into the right hepatic duct, anterior or posterior spiral insertion of cystic duct and the presence of a very long or short cystic duct. However, in all these anomalies the insertion of the cystic duct onto the neck of gallbladder (GB) has always been constant. In this case report, we describe a cystic duct arising from the common bile duct (CBD), but ending in the GB fundus, an anomaly that has been never described in literature so far.
| ¤ Case Report|| |
A 53-year-old female with no comorbidities presented with a 4-month history of intermittent colicky right hypochondriac (RHC) pain, exaggerated on consuming fatty foods and was occasionally associated with non-bilious, non-blood-stained vomiting. There was no other positive history. General examination was unremarkable and per abdominal examination revealed mild tenderness in the RHC with no palpable mass. Routine laboratory investigations including liver function tests (LFT) was normal. An USG of the abdomen showed chronic calculous cholecystitis with a normal CBD. She was posted for an LC. On dissection of the Calot's triangle, the cystic artery was identified and clipped. However, the cystic duct could not be identified. The Hartmann's pouch and infundibulum were completely dissected out of the Calot's triangle. There was no bile leak during dissection. A tubular structure was seen on the under surface of the liver (GB fossa) traversing upwards and inserting into the GB fundus, where it thinned out [Figure 1]. This structure was identified to be the cystic duct and was clipped near the fundus after complete posterior dissection of the GB out of the liver bed [Figure 2]. Due to the doubtful anatomy of the cystic duct, the surgery was converted to open. A long cystic duct was identified arising from the CBD and travelling upwards on the under surface of the liver for approximately 6 cm before inserting onto the fundus of the GB. This long cystic duct was ligated close to the CBD. A drain was placed in the GB bed, and the incision was closed in layers.
|Figure 1: Cystic duct traversing up towards the gall bladder fundus (arrow)|
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|Figure 2: (a) Cystic duct thinned out and entering the gall bladder fundus (arrow); (b) cystic duct clipped|
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Postoperatively, she made an uneventful recovery, and the abdominal drain was clear with no bile. LFT repeated on post-operative day 3 was normal. She was discharged after the drain removal and at the end of 3 months is doing well.
| ¤ Discussion|| |
A classical anatomy of the biliary tree is present only in 30% of individuals; thus, it may be quoted that anomalies are the rule. A thorough knowledge of the normal anatomy and its variants is important for successful surgical intervention. The most common anomaly causing problems during an LC is an aberrant right hepatic duct. The most dangerous anomaly is when the cystic duct joins a low lying aberrant right posterior sectoral duct.
A retrospective study done over a period of 3 years in Turkey on 590 patients who underwent magnetic resonance cholangiopancreatography (MRCP) identified 39.5% of patients with biliary tract variations with a total of 275 types of variations. In a similar retrospective study done in Italy between 2004 and 2007 on 350 patients undergoing MRCP for various indications, anatomical variations were found in 42.3% of patients of which 8.8% were anomalies of the cystic duct. The most common anomaly of the cystic duct was its low insertion into the right hepatic duct. In all the above studies among the numerous anatomical variations picked up, none have described a high insertion of cystic duct at the GB fundus, that occurred in our patient.
Pre-operative baseline investigations done before LC will never pick up extra-hepatic biliary ductal abnormalities and are often found as a 'surprise'. It is important to clearly identify the structures within the Calot's triangle to prevent iatrogenic injury to the bile or hepatic ducts, which contribute to the morbidity and mortality. In such patients, intraoperative cholangiography (IOC) helps to delineate biliary tree anatomy, prevent bile duct injury and image stones in the CBD, although the routine use of IOC in LC remains a contentious issue. The anomaly presented in the above case report has not been described previously in literature. The need of knowing and understanding of the anatomical variations of the extrahepatic biliary tree cannot be under-stressed!
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given her consent for her images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published, and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]