Colonic duplication presenting as a huge abdominal mass in an adult female
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Duplications of the alimentary tract are a rare congenital malformation. Most of the cases are symptomatic and diagnosed before 2 years of age. Here, we report a young female presented with a huge abdominal mass, and colonic duplication was confirmed during laparotomy.
A 29-year-old female had chronic constipation treated with laxative agents. She presented to the emergency room with abdominal cramping for 3 days, accompanied with intermittent fever and vomiting. A huge movable abdominal mass was noted during physical examination. Computerized tomography showed a long segmental dilated bowel lumen with stool impaction and bowel wall thickening of the dilated lumen in the left abdomen, highly suggestive of a long tubular colon duplication. The patient underwent subtotal colectomy. Specimen subsequently confirmed the diagnosis for colonic duplication from cecum to sigmoid colon, and the duplicated colon was found on the antimesenteric side of the native colon. She had a stable postoperative course and was discharged 9 days later.
Duplications of the alimentary tract are a rare congenital anomaly. Colonic duplication is an even more unusual malformation of this type. It can be classified into cystic or tubular type according to the gross morphology and may or may not be associated with other congenital anomalies. Most common presentation includes abdominal distention, refractory constipation, and bowel obstruction like many other colorectal conditions. Thus, its indistinct symptoms make it difficult to be diagnosed preoperatively. The recommended treatment is surgical resection of the duplicated lumen along with the attached native colon.
KeywordsColonic duplication Adult Tubular type
Duplications of gastrointestinal tract are rare congenital diseases and are usually diagnosed in childhood. The diagnosis can be challenging in adulthood because of vague abdominal symptoms. We report a case of a young female with a tubular-type colonic duplication from the cecum to the sigmoid-descending colon junction presenting to our emergency room as a huge abdominal mass.
A 29-year-old woman presented to our emergency department with a huge abdominal mass, accompanied by abdominal cramping, vomiting, and fever for 3 days. She had had chronic constipation since childhood. Prior barium lower gastrointestinal study performed 9 years ago reported the presence of markedly dilated colon with excessive fecal material retention and initial impressions of Hirschsprung’s disease or functional constipation were made. The patient refused further assessment with colonoscopy for tissue proof. She was conservatively managed with laxative agents and subsequently lost follow-up for 9 years until the present visit to our emergency department. During this period, she was treated as chronic constipation with various laxatives at multiple institutions.
Duplications of the gastrointestinal tract are rare. These anomalies can develop anywhere along with the alimentary tract and are most commonly found in the small intestine. Colonic duplication comprises 6.8% of all gastrointestinal duplications . Pathologically, duplications of GI tract are defined as (1) a microscopic structure resembling the normal bowel, having mucosa, muscle layers, and serosa; (2) lining with a mucosa similar to some portion of the alimentary tract; and (3 ) lesions that are contiguous with some portion of the intestinal tract . Gastrointestinal duplications can be classified as cystic (spherical) or tubular according to their gross morphologies. The tubular type of gastrointestinal duplication contributes to less than 20% of cases. Such lesions can present in T-shape or Y-shape and are frequently associated with concurrent genitourinary anomalies or colovesical fistula . The pathogenesis of this disease is not fully understood. Several theories have been proposed for the development of gastrointestinal duplications but none can solely explain all the locations where this anomaly may occur. Moreover, a great variety of explanations suggestive of the development of this entity may be multifactorial .
Most patients with colonic duplication are diagnosed before the age of two. The most common clinical presentation of colonic duplications is intestinal obstruction due to compression of the native colon by dilated blind-ended duplicated lumen, with other symptoms including constipation, vomiting, volvulus, and perforation . Since the abdominal symptoms are vague, some patients with indolent symptoms may not be detected until their adulthood. In fact, if without other associated malformations, most adult patients remain undiagnosed unless complications develop.
Owing to non-specific and a wide variety of abdominal symptoms, the diagnosis of colonic duplication could be very challenging. Though plain abdominal radiograph and ultrasonography might be useful, the diagnosis is best established by abdominal CT. Colonoscopy is not helpful unless the ostium between duplication and the native lumen is large enough to be detected . Despite the availability of various diagnostic tools, the preoperative diagnosis of colonic duplication was made in only one out of seven cases in a case series study .
The management of asymptomatic colonic duplication is not well established. Some authors suggest that surgical resection should be reserved for symptomatic causes, though others suggest resection once the diagnosis is made to prevent further complications and malignant change [6, 7]. For symptomatic patients, on the other hand, most authors recommend en-bloc resection together with the normal colon because the duplicated colon always shares the same mesenteric blood supply with the normal colon. Either laparotomy or minimally invasive surgery can be considered according to the patient’s clinical presentation. Prognosis is good owing to the benign nature of the disease.
Here, we report a very rare tubular type of colonic duplication without any genitourinary or other congenital defect in an adult, presenting with a huge abdominal mass initially. Surgical specimen showed a long segmental tubular duplication from the cecum to the sigmoid-descending colon junction, with a huge communication between the native and duplicated lumen at the transverse colon. The bowel continuity was reconstructed without diverting the stoma, and the patient recovered well from the operation.
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