Adult ileocolic intussusception caused by a terminal ileal lipoma: A case report

Figure 1 Abdominal computed tomography. A and B: Axial and coronal computed tomography (CT) images showing a well-circumscribed, oval-shaped mass (arrow) with homogeneous fat attenuation (approximately -53 Hounsfield units) within the ascending colon, pathognomonic for a lipoma, acting as the lead point for the intussusception; C: Axial CT image demonstrating the “target sign” (arrow), formed by the concentric rings of the edematous intussusceptum within the intussuscipiens; D: Coronal CT image showing the elongated intussuscepted bowel loop, known as the “sausage sign” (dashed arrow). HU: Hounsfield units.

Figure 2 Colonoscopy. A: A raised mass had an eroded surface in the ascending colon; B: The mass was continuous with the ileum.

Figure 3 Intraoperative view. A: The ileum was intussuscepted into the cecum and ascending colon; B: The intussuscepted segment was approximately 10 cm in length and was edematous and irreducible.

Figure 4 Tumor and histopathological features. A: Gross specimen showing a well-circumscribed, oval-shaped, yellowish submucosal mass with an intact capsule; B: The tumor is composed of mature adipocytes (hematoxylin-eosin, × 50); C: Erosion and ulceration of the overlying mucosa (hematoxylin-eosin, × 50).