case_images: PMC11347276_01
case_images: Abdominal CT revealed a regular low-density mass (A, arrow) in the pelvic cavity, about 9.3 cm x 9.0 cm x 6.7 cm in size; which presented significant uneven enhancement on contrast-enhanced CT (B, arrow).
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case_images: PMC11347276_01_fmed-11-1461205-g001.jpg
case_images: fig1
case_images: On November 24th, the patient underwent an abdominal CT examination (Figure 1) and the results showed a slightly low-density mass with unclear boundary with the sigmoid colon in her pelvic cavity, which presented significant uneven enhancement on contrast-enhanced CT, suggesting a possible malignant tumor.
case_images: Fluorine-18 fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/CT imaging of the patient. The maximum intensity projection (MIP, A) showed a significantly increased 18F-FDG uptake in the lower abdominal area (arrow). Axial CT (B), PET (C) and PET/CT fusion (D) showed that the lesion with significantly increased 18F-FDG uptake, with a SUVmax of 9.3 (arrows), which was located in the serosal surface of the sigmoid colon, and the adjacent intestinal tube is compressed, the proximal intestinal tube is dilated, and liquid exudation shadow is seen around the mass, and a small amount of fluid is seen in the pelvic cavity.
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case_images: PMC11347276_01_fmed-11-1461205-g002.jpg
case_images: fig2
case_images: The results showed obviously increased 18F-FDG uptake in this lesion, and no hot spot lesions were observed in the rest of the body (Figure 2).
case_images: (A) Hematoxylin-eosin staining revealed diffuse spindle shaped tumor cells and scattered inflammatory cells within the lesion; Immunohistochemical results showed that the tumor cells positively expressed SMA (B), ALK (C) and vimentin (D). Notes: SMA, smooth muscle actin; ALK, anaplastic lymphoma kinase.
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case_images: PMC11347276_01_fmed-11-1461205-g003.jpg
case_images: fig3
case_images: Hematoxylin-eosin staining revealed diffuse spindle shaped tumor cells and scattered inflammatory cells in resected tumor tissue (Figure 3).