case_images: PMC11007083_01
case_images: MIP image (A) acquired 60 min after injection showed that large intensity uptake in the left upper abdomen with SUVmax of 13.2 (black arrow), 14.6 (red arrow) and moderate radioactive uptake overlapping the spine with SUVmax of 9.1 (white arrow). On axial CT (B-D) and PET/CT fusion (E-G) images, the mass with high radioactivity uptake was located in the spleen-gastric space (black arrow), left retroperitoneum (red arrow), and right retroperitoneum (white arrow). Notes: MIP, maximum intensity projection; CT, computed tomography; PET, positron emission tomography; 18F-FDG, 18F-labeled fluoro-2-deoxyglucose; SUVmax, maximum standard uptake value.
case_images: fonc-14-1321179-g001.jpg
case_images: PMC11007083_01_fonc-14-1321179-g001.jpg
case_images: f1
case_images: Figure 1 ) revealed multiple soft tissue masses in the abdominal cavity and retroperitoneum, exhibiting heightened radioactive uptake, which were poorly demarcated from the surrounding structures, and the adjacent bowel was displaced by pressure ( Figure 2 ). Furthermore, a delayed PET/CT scan at 180 min was performed to understand the delayed uptake of 18F-FDG by the mass over time and further determine the location of the mass and the relationship between the mass and the intestinal wall.
case_images: A delayed PET/CT scan at 180 min (A, MIP) was acquired, axial CT (B-D) and PET/CT fusion (E-G) showed a further increase in 18F-FDG radioactivity in the abovementioned lumps, with SUVmax of 16.0, 17.1, and 16.7 from top to bottom, respectively. Furthermore, the location of the lowest mass shifted from the initial left side of the spine to the right side of the spine (G, I, white arrows).Notes: MIP, maximum intensity projection; CT, computed tomography; PET, positron emission tomography; 18F-FDG, 18F-labeled fluoro-2-deoxyglucose; SUVmax, maximum standard uptake value.
case_images: fonc-14-1321179-g002.jpg
case_images: PMC11007083_01_fonc-14-1321179-g002.jpg
case_images: f2
case_images: Figure 1 ) revealed multiple soft tissue masses in the abdominal cavity and retroperitoneum, exhibiting heightened radioactive uptake, which were poorly demarcated from the surrounding structures, and the adjacent bowel was displaced by pressure ( Figure 2 ). Furthermore, a delayed PET/CT scan at 180 min was performed to understand the delayed uptake of 18F-FDG by the mass over time and further determine the location of the mass and the relationship between the mass and the intestinal wall.
case_images: Hematoxylin and eosin staining showed uniformly dispersed fusiform cells (A). Immunohistochemical results showed that the tumor expressed CD34 (B), CD117 (C), DESMIN (D), CK (E), DOG-1 (F), S100 (G), and SMA (H).
case_images: fonc-14-1321179-g003.jpg
case_images: PMC11007083_01_fonc-14-1321179-g003.jpg
case_images: f3
case_images: Hematoxylin and eosin staining revealed the presence of uniformly dispersed fusiform cells (as shown in  Figure 3 ).