case_images: PMC11116560_01
case_images: Abdominal CT images of Case 1 (A) Taken on 2023-10-24 (B) Taken on 2024-01-15. The image reveals a mass-like low-density shadow in the left abdomen with well-defined borders, surrounded by vascular structures at the edges. The maximum cross-section recorded on 2023-10-24 is 7.6x5.6cm, while the maximum size observed on 2024-01-15 is 14.5x11.2x7.1cm.
case_images: fonc-14-1401839-g001.jpg
case_images: PMC11116560_01_fonc-14-1401839-g001.jpg
case_images: f1
case_images: On October 24, 2023, routine follow-up abdominal contrast-enhanced CT revealed a left abdominal mass (7.6x5.6cm), initially diagnosed as metastatic lymph node involvement ( Figure 1A ). Laboratory tests were normal, and abdominal CT showed a left midabdominal low-density mass (14.5x11.2x7.1cm), diagnosed as a mesenteric smooth muscle tumor ( Figure 1B ).
case_images: The tumor and part of the jejunum of Case 1 Arrows 1: The larger tumor (18x12x9cm). Arrows 2: The smaller tumor (3.5x3x2cm) Arrows 3: The original Braun anastomosis.
case_images: fonc-14-1401839-g002.jpg
case_images: PMC11116560_01_fonc-14-1401839-g002.jpg
case_images: f2
case_images: Completely cut off the tumor and part of the jejunum (including the original Braun anastomosis) ( Figure 2 ).
case_images: (A) Pathological presentation of Case 1 (B) Pathological presentation of Case 2. Arrows 1: Matrix composed of abundant interwoven collagen fibers. Arrows 2: Spindle/ovoid-shaped fibroblast cells. Arrows 3: Elongated cell nuclei without significant atypia.
case_images: fonc-14-1401839-g003.jpg
case_images: PMC11116560_02_fonc-14-1401839-g003.jpg
case_images: f3
case_images: Both resection margins were negative ( Figure 3B ).
case_images: Timeline for Case 1.
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case_images: PMC11116560_01_fonc-14-1401839-g004.jpg
case_images: f4
case_images: The timeline of relevant diagnoses and treatments is showcased in  Figure 4 .
case_images: PMC11116560_02
case_images: (A) Pathological presentation of Case 1 (B) Pathological presentation of Case 2. Arrows 1: Matrix composed of abundant interwoven collagen fibers. Arrows 2: Spindle/ovoid-shaped fibroblast cells. Arrows 3: Elongated cell nuclei without significant atypia.
case_images: fonc-14-1401839-g003.jpg
case_images: PMC11116560_02_fonc-14-1401839-g003.jpg
case_images: f3
case_images: Both resection margins were negative ( Figure 3B ).
case_images: Abdominal CT images of Case 2 (A) Taken on 2024-01-05 (B) Taken on 2024-02-20. The image shows a mass of soft tissue density behind the transverse colon in the upper abdomen, with uneven internal density and unclear demarcation from the adjacent small intestine. The maximum cross-section recorded on 2024-01-05 is 7.4x5.0cm, while the maximum size observed on 2024-02-20 is 7.0x4.8x7.7cm.
case_images: fonc-14-1401839-g005.jpg
case_images: PMC11116560_02_fonc-14-1401839-g005.jpg
case_images: f5
case_images: On January 5, 2024, an abdominal CT scan revealed a space-occupying lesion (7.4x5.0 cm) in the left lower abdomen ( Figure 5A ). A repeat abdominal enhanced CT scan demonstrated a soft tissue density lesion (7.0x4.8x7.7 cm) in the mesenteric region of the lower abdomen ( Figure 5B ).
case_images: The tumor and part of the jejunum of Case 2 Arrows 1: The tumor (8.5x7x5cm). Arrows 2: Part of the jejunum (20cm).
case_images: fonc-14-1401839-g006.jpg
case_images: PMC11116560_02_fonc-14-1401839-g006.jpg
case_images: f6
case_images: The tumor measured 8.5x7x5 cm ( Figure 6 ), and five peri-intestinal lymph nodes showed reactive hyperplasia.
case_images: Timeline for Case 2.
case_images: fonc-14-1401839-g007.jpg
case_images: PMC11116560_02_fonc-14-1401839-g007.jpg
case_images: f7
case_images: The timeline of relevant diagnoses and treatments is showcased in  Figure 7 .