Demonstrate the importance of different imaging modalities in detecting small bowel neoplasms and identifying their characteristic radiologic features. Review the common mimics of small bowel neoplasms and their distinguishing features.

Small bowel tumors are rare, comprising only 3% of all alimentary tract neoplasms. Patients are usually asymptomatic or have nonspecific symptoms like abdominal pain, nausea, vomiting, and/or weight loss or in advanced stages, can present with more severe symptoms such as bowel obstruction, bowel perforation, and/or intestinal bleeding. Imaging remains the primary mode of diagnosing small bowel neoplasms due to the limitations of endoscopy. Even though there may be overlapping features, there are certain unique radiographic characteristics that favor the diagnosis of one neoplasm over...

Small Bowel Neoplasms Malignant Tumors Neuroendocrine Tumors (NET): NETs, formerly used interchangeably with carcinoid tumors,arise from the cells of the endocrine system in the gastrointestinal tract. They account for 1.2%–1.5% of all gastrointestinal neoplasms. They are classified by histologic morphology (well or poorly-differentiated) and degree of differentiation (using Ki67 index). These tumors may endogenously secrete vasoactive peptides leading to systemic paraneoplastic symptoms known as carcinoid syndrome. NETs most commonly arise in the distal ileum, then jejunum, followed by duodenum. NETs on CT typically present as...

A multimodality imaging approach can help detect and differentiate small bowel neoplasms and their mimics.

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