case_images: PMC9773366_01
case_images: Capsule endoscopy (A, B) images of patient A. (A, B) Mucosa of the proximal jejunum showed polypoid elevation, surface hyperemia, edema, erosion, white moss attachment, and active bleeding.
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case_images: CT of chest, abdomen, and pelvis revealed a few fibrosis foci in the left lower lung, small hepatic cysts, and slightly reduced density of heart cavity, consistent with anemia. Capsule endoscopy showed that the mucosa at the proximal end of the jejunum is polypoid, with congestion, edema, erosion, white moss attachment, and active bleeding, as shown in  Figure 1 .
case_images: Deep enteroscopy (A-C) images of patient A. (A-C) Granular hyperplasia of the mucosa 190-200 cm away from the ligament of Treitz, and the surface was erosive, with white speckles attached.
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case_images: The surface was erosive, with white speckles attached, and the distal mucosa was normal, as shown in  Figure 2 . The initial diagnosis of the patient was jejunal lesion (nature unknown because of the patient's refusal of pathological examination).
case_images: Pathological results (HE staining, x100). (A) Pathology of patient A after deep enteroscopy. (B) Postoperative pathology of patient A. (C) Postoperative pathology of patient B.
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case_images: Pathology indicated small intestinal lymphangioma, and no cancer involved both ends, as shown in  Figure 3 .
case_images: PMC9773366_02
case_images: Pathological results (HE staining, x100). (A) Pathology of patient A after deep enteroscopy. (B) Postoperative pathology of patient A. (C) Postoperative pathology of patient B.
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case_images: Pathology indicated small intestinal lymphangioma, and no cancer involved both ends, as shown in  Figure 3 .
case_images: CT of patient B's abdomen. Pelvic local intestinal wall edema, disorder, and mesenteric edema.
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case_images: AFP, CA19-9, and CEA. Abdominal enhanced CT showed local intestinal wall edema, structural disorder, and mesenteric edema, as shown in  Figure 4 .
case_images: Capsule endoscopy of patient B. (A-D) The lesion mucosa showed continuous multiple nodular protrusions, with redness and erosion on the surface.
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case_images: Capsule endoscopy showed ileal lesions, with multiple continuous nodular changes in the mucous membrane, and the surface was red and erosive, as shown in  Figure 5 .
case_images: Surgical excision of gross specimen for patient B. (A) Diseased bowel piece; (B) cut a section of bowel intraoperatively, with a length of 38 cm and a diameter of 4-7 cm; (C) 6.5 cm from the end of one incision and 15 cm from the end of the other, a mucous vesicular uplift area of 11 cm x 7 cm can be seen. The mesentery surface is hard in texture, and the section is spongy and gray yellow.
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case_images: The mesenteric surface was hard in texture, and the cut surface was spongy and gray yellow, as shown in  Figure 6 .