How is intussusception diagnosed in adults?

Intussusception in adults is primarily diagnosed using a CT scan. This imaging technique is particularly effective because it provides detailed cross-sectional images of the abdomen, which help visualize the presence of the characteristic "target sign" or "doughnut sign" associated with intussusception. The CT scan can also reveal the extent of the bowel involved, any associated mass or obstruction, and signs of ischemia, making it a comprehensive tool for diagnosis.

While ultrasound can be useful, especially in pediatric cases, its effectiveness diminishes in adults due to greater body habitus and gas interference. MRI is less commonly used for diagnosing intussusception in adults because it is more time-consuming and typically reserved for specific scenarios like pregnant patients. Endoscopy may help in managing certain gastrointestinal issues but is not a primary diagnostic tool for intussusception as it does not provide the necessary visualization of the bowel in a three-dimensional context. Therefore, the CT scan stands out as the preferred and most reliable method for diagnosing intussusception in adult patients.