case_images: PMC10901038_01
case_images: Macroscopic specimen of the resected small bowel. 1A: tumor invading serosa and mesentery; 1B: polypoid tumor protruding in the lumen with ulceration of overlying mucosa
case_images: cureus-0016-00000053141-i01.jpg
case_images: PMC10901038_01_cureus-0016-00000053141-i01.jpg
case_images: FIG1
case_images: On gross examination of the small bowel resection specimen, a polypoid mass measuring 8 x 5 x 5 cm and exhibiting both exophytic and endophytic growth was seen (Figures 1A, 1B).
case_images: Microscopic specimen, H&E stain. 2A: tumor arranged in sheets with microcystic areas and delicate vasculature; 2B: vascular tumor emboli seen; 2C: tumor involving serosa and mesentery; 2D: tumor cells with clear cytoplasm and borders (2A, B, and C: 10X magnification. 2D: 40X magnification)
case_images: cureus-0016-00000053141-i02.jpg
case_images: PMC10901038_01_cureus-0016-00000053141-i02.jpg
case_images: FIG2
case_images: On microscopic examination, the tumor was arranged in a trabecular pattern and composed of cells with clear to faint eosinophilic cytoplasm with well-defined cytoplasmic borders (Figures 2A-2D).
case_images: Immunohistochemistry. 3A: CD10-positive; 3B: PAX8 patchy nuclear staining; 3C: EMA-positive; 3D: CAM5.2-positive
case_images: cureus-0016-00000053141-i03.jpg
case_images: PMC10901038_01_cureus-0016-00000053141-i03.jpg
case_images: FIG3
case_images: On immunohistochemistry, the tumor cells were positive for pan-cytokeratin (AE1/AE3, CAM5.2, EMA), PAX8, and CD10 (Figures 3A-3D).