Intussusception of the small bowel is most common in children, in whom it is usually due to invagination of swollen lymphoid tissue (Peyer‘s patches) in the wall of the distal ileum. In adults, it is rare, causing only between 1 – 5 percent of cases of bowel obstruction. The usual cause a polypoid tumour, as seen in this specimen, acting as a pathological lead point being pulled forward by peristalsis, and thereby causing telescoping of the affected portion of bowel distally. Presentation may be of intermittent symptoms of bowel obstruction and in some cases excruciating pain. Classification of intussusception can be by causal pathology or by location. Abdominal CT scan will typically demonstrate a typical “target sign” with alternating hyper/hypodense layers.
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