case_images: PMC7610031_01
case_images: Intussusception seen on CT.
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case_images: PMC7610031_01_gr1.jpg
case_images: fig0005
case_images: Ultrasound and computed tomography of the abdomen revealed ileocaecal intussusception (Fig. 1).
case_images: Intussusception with tumour within.
case_images: gr2.jpg
case_images: PMC7610031_01_gr2.jpg
case_images: fig0010
case_images: The specimen was cut open and it showed a 1 cm tumour at the ileocaecal junction (Fig. 2).
case_images: Mucosal-submucosal tumour with eroded overlying mucosa. The tumour cells form nests and trabeculae (H&E, x40).
case_images: gr3.jpg
case_images: PMC7610031_01_gr3.jpg
case_images: fig0015
case_images: The tumour invaded into the muscularis propria and subserosa (Fig. 3).
case_images: The tumour cells have round to oval nuclei with irregular chromatin clumps and small nucleoli. No mitotic activity seen (H&E, x400).
case_images: gr4.jpg
case_images: PMC7610031_01_gr4.jpg
case_images: fig0020
case_images: There was no obvious mitosis identified (mitotic count <1/10 HPF) (Fig. 4).
case_images: The tumour cells show diffuse immunoreactivity for Chromogranin A (a), Synaptophysin (b) and CDX2 (c) and focal immunoreactivity for CD56 (d).
case_images: gr5.jpg
case_images: PMC7610031_01_gr5.jpg
case_images: fig0025
case_images: The immunohistochemical studies showed the tumour cells were diffusely positive for CKAE1/AK3, chromogranin, synaptophysin and CDX2 and focally positive for CD56 (Fig. 5).