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Carcinoid tumor of the minor papilla in complete pancreas divisum presenting as recurrent abdominal pain
© Kim et al; licensee BioMed Central Ltd. 2010
Received: 15 November 2009
Accepted: 12 February 2010
Published: 12 February 2010
Tumors of the minor papilla of the duodenum are extremely rare, and they are mostly neuroendocrine tumors, such as somatostatinomas and carcinoid tumors. However, true incidence of carcinoid tumors in minor papilla might be much higher, because patients with minor papillary tumors usually remain asymptomatic. We report a very unusual case of carcinoid tumor in a patient with complete pancreas divisum with a review of the literature.
A 56-year-old female patient was referred for evaluation of pancreatic duct dilatation noted on abdominal ultrasonography and computerized tomography. She complained of intermittent epigastric pain for 6 months. A MRCP and ERCP revealed complete pancreas divisum with dilatation of the main pancreatic duct. On duodenoscopy, a small, yellows, subepithelial nodule was visualized at the minor papilla; biopsy of this lesion revealed a carcinoid tumor. She underwent a pylorus-preserving pancreaticoduodenectomy. The histologic evaluation showed a single nodule, 1 cm in diameter, in the submucosa with duodenal and vascular invasion and metastasis to the regional lymph nodes.
Although the size of the carcinoid tumor was small and the tumor was hormonally inactive, the concomitant pancreas divisum led to an early diagnosis, the tumor had aggressive behavior. Carcinoid tumors of the minor papilla should be included in the differential diagnosis of recurrent abdominal pain or pancreatitis of unknown cause.
Tumors of the minor papilla of the duodenum are very rare; the majority of tumors of the minor papilla of the duodenum are neuroendocrine tumors (NETs), such as somatostatinomas and carcinoid tumors [1–7]. Carcinoid tumors arise from enterochromaffin cells, and gastrointestinal carcinoids are usually located in the appendix, ileum, stomach, and rectum. Carcinoids of the minor papilla are extremely rare; only 8 cases have been reported in the literature [1–8].
Pancreas divisum is the most common congenital anomaly of the pancreas, resulting from failure of fusion between the dorsal and ventral pancreatic ducts. Most exocrine secretions of the pancreas drain through the dorsal pancreatic duct and the minor papilla in the pancreas divisum. Patients with pancreas divisum usually have no clinical symptoms, but sometimes have recurrent abdominal pain or pancreatitis when disturbances in drainage of pancreatic secretion through the minor papilla occur.
We report a very unusual case of a carcinoid tumor of the minor papilla arising in a patient with complete pancreas divisum who presented with recurrent abdominal pain.
A 56-year-old female was referred to our department for evaluation of dilatation of the main pancreatic duct noted on abdominal ultrasonography and CT scan. She complained of intermittent epigastric pain 6 months prior to the referral. She did not drink alcohol or take any medications, and had no significant medical history. She denied sweating, diarrhea, or facial flushing.
Laboratory data on admission were as follows: total bilirubin, 0.47 mg/dL; AST, 41 U/L; ALT, 33 U/L; ALP, 161 U/L; GGT, 32 U/L; and amylase, 147 U/L. The complete blood count, urine analysis, and serum electrolytes were within normal limits. The CA 19-9 was 7.99 U/ml and the 5-HIAA was 21.44 mg/day.
The term carcinoid has been replaced with NET based on the development of diagnostic tools and immunochemistry. Recently, NETs have been reclassified within the spectrum of gastroenteropancreatic-neuroendocrine tumours (GEP-NETs) . However, the term "classical carcinoid" is used synonymously with the term serotonin-producing GEP-NETs . A classical carcinoid tumor is usually still referred to as a carcinoid tumor. The incidence of gastrointestinal carcinoids is 1.6-2.0 cases per 100, 000 persons per year , but the true prevalence may be higher 
Although more than 70 cases involving carcinoid tumors of the major papilla have been reported , only 8 cases of carcinoid tumors involving the minor papilla have been reported [1–8]. Carcinoids and endocrine cell micronests (ECMs) in the minor papilla occur more frequently than generally thought. In a single surgical specimens and autopsy study, the incidence of carcinoids and neoplastic ECMs of the minor papilla could reach 10%. Furthermore, carcinoids in the minor papilla are twice as common as carcinoids of the major papilla, and neoplastic ECMs of the minor papilla are found five times as often . This discrepancy may be explained by the fact that tumors of the major papilla are more likely to develop symptoms, such as jaundice or abdominal pain, due to ampullary obstruction, whereas patients with minor papillary tumors usually remain asymptomatic because there is no biliary or pancreatic obstruction.
Carcinoid tumors of the minor papilla of the duodenum are very difficult to diagnose because they are usually small in size and located at the submucosal area, and they are frequently asymptomatic  and rarely accompanied with endocrine manifestations . In our case, although the size of the carcinoid tumor was small and the tumor was hormonally inactive, the concomitant pancreas divisum led to an early diagnosis because obstruction of the minor papilla due to the carcinoid tumor caused recurrent abdominal pain and resulted in dilatation of the main pancreatic duct. Of the eight reported cases of carcinoid tumors involving the minor papilla in the literature, five cases have been associated with pancreas divisum and presented with recurrent abdominal pain or pancreatitis [3–7].
The endoscopic features of carcinoid tumors are small, round, sessile, or polypoid lesions with a smooth surface. Carcinoid tumors usually have normal overlying mucosa and seldom ulcerate . An EUS may be useful for the diagnosis of carcinoids and evaluation of regional lymph node metastasis, but CT or MRI scans are not helpful in most cases because of the small size. Carcinoid tumors usually appear as a homogenous, well-demarcated, and mildly hypoechoic or isoechoic mass that arises from the second layer on EUS. In addition, EUS can define the size, tumor invasion, and regional lymph node metastasis . The pre-operative diagnosis of carcinoid tumors of the duodenal papillae is largely dependent upon endoscopic biopsy. However, a correct diagnosis is made in only 14% of the patients13 because the tumors are usually submucosal in location . As in our case, multiple deep biopsies are required to enhance the tissue diagnosis.
Though endoscopic resection may be an alternative to surgical resection [8, 17], radical surgery is usually recommended as the treatment of ampullary carcinoid tumors [13, 18] because carcinoid tumors of this area appear to have more aggressive biology with presence of metastasis in approximately 50% of the cases, irrespective of the size of the primary tumor or mitotic activity [13, 19, 20]. In our case, despite the tumor being 1 cm in diameter, the histologic examination revealed duodenal and vascular invasion and metastasis to the regional lymph nodes. In conclusion, carcinoid tumors of the minor papilla are very rarely found, but the true incidence might be much higher, and the tumors frequently have aggressive behavior. Carcinoid tumors of the minor papilla should be included in the differential diagnosis of recurrent abdominal pain or pancreatitis of unknown cause.
Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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