Alimentary Tract Duplications Workup
- Author: Gail E Besner, MD; Chief Editor: Marleta Reynolds, MD more...
Laboratory Studies
- The standard admission laboratory studies, including CBC count and electrolyte levels, are usually appropriate.
Imaging Studies
- Radiography of the chest and abdomen: Preoperative diagnosis of alimentary tract duplications is often difficult. Symptoms usually include pain, and the alimentary tract duplication is often confused with other more common diagnoses, such as hypertrophic pyloric stenosis or intestinal obstruction secondary to intussusception or volvulus (see the images below). Plain radiographs of the chest and abdomen should be routinely obtained; however, because of the nonspecificity of their results, making a preoperative diagnosis on the basis of radiographic findings is unlikely.
Abdominal radiograph of an infant with acute onset of bilious vomiting and abdominal distention secondary to a duplication cyst at the terminal ileum.
A small ileal duplication cyst causing complete obstruction of the small bowel (same patient as in the image above). - CT scanning of the chest and abdomen: CT scanning of the chest or abdomen is useful in establishing a diagnosis of alimentary tract duplication during the preoperative workup and may be used to evaluate for synchronous lesions once a single duplication has been identified.
- Ultrasonography of the chest and abdomen: Like CT scanning, ultrasonography is also helpful in establishing a preoperative diagnosis and may similarly be used as a screening tool to address the 10-20% incidence of multiple lesions.
- MRI: MRI may be necessary if neurologic symptoms of spinal cord compression are observed and if evidence of bony spinal abnormalities is present on plain film or CT scan findings. These symptoms may be indicative of intraspinal cysts.
- Prenatal ultrasonography: Prenatal ultrasonography may occasionally detect enteric cysts.
Histologic Findings
Histologic analysis of alimentary tract duplications typically reveals at least one outer muscular layer with an inner GI mucosal lining. The mucosal lining does not necessarily correspond to that of the adjacent normal intestine and may be composed of several different types of GI mucosa.
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