Common bile duct adenocarcinoma in a patient with situs inversus totalis: report of a rare case
© Benhammane et al.; licensee BioMed Central Ltd. 2012
Received: 30 September 2012
Accepted: 27 November 2012
Published: 12 December 2012
Situs inversus totalis represents an unusual anomaly characterized by a mirror-image transposition of the abdominal and thoracic viscera. It often occurs concomitantly with other disorders that make difficult diagnosis and management of abdominal pathology. The relationship between situs inversus totalis and cancer remains unclear.
We describe a 33-year old Guinean man with situs inversus totalis who presented with obstructive jaundice. Imaging and endoscopic modalities demonstrated a mass of distal common bile duct which biopsy identified an adenocarcinoma. The patient was successfully treated by cephalic pancreaticoduodenectomy followed by adjuvant chemoradiation and he is doing well without recurrence 8 months after surgery.
The occurrence of bile duct adenocarcinoma in patient with situs inversus totalis accounts as a rare coincidence. In this setting, when the tumor is resectable, surgical management should be considered without contraindication and must be preceded by a careful preoperative staging.
KeywordsSitus inversus totalis Bile duct cancer Preoperative staging Surgical management
Situs inversus totalis (SIT) is a rare congenital condition characterized by a mirror-image transposition of both the abdominal and thoracic viscera, its incidence accounts for 1/8000 to 1/25,000 of the normal population . This condition may cause difficulties in the diagnosis and therapeutic management of abdominal pathology [2, 3]. An increased risk of cardiac, splenic and hepatobiliary malformations are found in patients with SIT ; this abnormality is not considered to be a premalignant entity, however rare malignant neoplasms have been reported. A case of successfully treated common bile duct adenocarcinoma in a 33-year old man with SIT, an association described for the fourth time in the literature, is described.
Situs inversus is an uncommon congenital condition which is defined by a left-right transposition of the normally asymmetrical organs of the body as a mirror-image; transposition of thoracic and abdominal organs is termed situs inversus totalis . This form occurs with a frequency of 1/ 8000 to 1/25000 and is characterized by dextrocardia with complete reversal of the heart chambers, the aorta turns to the right, the left lung has 3 lobes and the right lung only 2 [1, 5]. In the abdomen, the stomach, spleen and pancreas are right sided of the body, the liver and gallbladder are left sided, the colonic flexures are reversed [4–6]. SIT occurs frequently with other disorders including Kartagener’s syndrome, primary ciliary dyskinesia, syndrome of asplenia or polysplenia as seen in our patient [1, 4, 7]. These anomalies are commonly associated with cardiovascular malformations which are more severe in the case of asplenia than in polysplenia . The other anomalies include short pancreas, symmetric lobulation of the liver, biliary atresia, absence of the gallbladder and genitourinary anomalies; blood vessels, nerves and lymphatic are also transposed [1, 7]. Pathogenic mechanisms of SIT have not been well elucidated. Some genetic patterns are involved including an autosomal recessive gene located to chromosome 14  and deletions affecting chromosomes 7 or 8 ; Recently, significant advancements in understanding the possible molecular pathways were made suggesting that mutation affecting CCDC11 and DNAH11 genes are involved in autosomal recessive laterality defects of diverse phenotype resulting in SIT [11, 12]. In addition, it has been shown that mutations in the TGF- β family gene and in the transcription factor HNF-3 β have a probable role in the process .
The association of SIT and neoplasia is a rare coincidence; only sporadic cases have been reported. The first case was published by Maekawa in 1927; it was an autopsy case of gastric carcinoma in a 43-year-old man with SIT . SIT is not considered a premalignant condition; however, despite its rarity and regarding the non-negligible number of published sporadic cases of cancer in this setting, a relationship between situs abnormalities and cancer has been suggested. Some authors postulate that unidentified genes involved in left-right arrangement may have susceptibility of cancer like CCDC11 gene that mutation or loss expression is involved in some cancers [15, 16]; in addition, it has been suggested that ciliary dysfunction via dysregulation of the hedgehog pathway may be the underlying cause of SIT , so Tomohiro et al. report that patients with SIT may be at high risk of developing cancer due to a congenital deficiency in the function of an intracellular protein, necessary to ciliogenesis, namely the KIF3 complex  leading to a ciliary dysfunction with a chronic inflammation which promote carcinogenesis via the pro-inflammatory nuclear factor kappa B . These hypotheses remain not well elucidated and further research is needed to assess the genetic association between SIT and malignancy. Many different cancers have been reported (cancer of stomach, colon, pancreas, biliary tract, ampulla of Vater, and kidney). Biliary tract carcinomas are relatively rare, representing less than 1% of cancers; gallbladder adenocarcinoma and cholangiocarcinoma account for 4% and 3% of all gastrointestinal cancers respectively . CT scan and ERCP are required for diagnosis and staging . Complete surgical resection is the only potentially curative treatment available for resectable disease leading to 5-year survival rates of 5–10% for gallbladder cancer and 10–40% for cholangiocarcinoma [20, 21]. In the setting of SIT, only three cases have been reported which were all cholangiocarcinoma [22–24]; herein we describe this association for the fourth time in literature; no case of gallbladder carcinoma has been reported. Careful preoperative staging by imaging modalities is important prior to invasive procedures in cancer patients with SIT in order to understand anatomic abnormalities [2, 15]. Evidently, SIT makes the surgical procedure challenging because of the difficulties in following surgical protocols in this situation. However, the presence of anatomic variations should not modify the principles of oncologic surgery.
SIT is an uncommon entity that often occurs concomitantly with other abnormalities. The relationship between SIT and cancer is not approved; further, studies are needed to identify precisely genetic and molecular patterns involved in development of malignancy in these patients. Because of the frequency of associated malformations of transposed organs and vascular and nervous anatomical variations that make difficult surgical management, special attention should be paid to the diagnosis and preoperative staging. Herein, we have described for the fourth time in the literature a case of unusual association of SIT and adenocarcinoma of common bile duct.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
Situs inversus totalis
Endoscopic retrograde cholangiopancreatography
Common bile duct
Coiled-coil domain containing 11
Axonemal heavy chain dynein type 11
Tumors growth factor β
Hepatocyte nuclear factor 3β
Kinesin 3 family.
All authors have made significant contributions by making diagnosis, treatment and intellectual input in the case and writing the manuscript.
The authors declare that they have no competing interests.
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