Key result
18F-FDG PET/CT imaging identified an extremely rare case of mesenteric vein tumor thrombosis associated with diffuse metastatic small cell carcinoma in an 87-year-old woman.
Why the study?
Intravascular tumor thrombus alters cancer staging, prognosis, and treatment, but venous tumor thrombus associated with small cell carcinoma is extremely rare.
This case highlights the rare presentation of superior mesenteric vein tumor thrombosis associated with small cell carcinoma on 18F-FDG PET/CT.
Answers are grounded in this paper and cite their sources.
Venous tumor thrombus in small cell carcinoma may alter staging and therapy; leaves open its true prevalence and optimal diagnostic approach.
The presence of intravascular tumor thrombus alters the staging, prognosis, and treatment paradigms of cancer patients. It most commonly complicates renal cell carcinoma, adrenocortical carcinoma, and hepatocellular carcinoma. Small cell carcinoma is a highly aggressive malignant neoplasm; however, venous tumor thrombus associated with small cell carcinoma is extremely rare. Herein, we report the fluorine-18-fluorodeoxyglucose (¹⁸F-FDG) positron emission tomography/computed tomography (PET/CT) findings in an 87-year-old woman presenting with diffuse metastatic small cell carcinoma and superior mesenteric vein tumor thrombosis.
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Cheng et al. (2026) studied this question. 18F-FDG PET/CT imaging identified an extremely rare case of mesenteric vein tumor thrombosis associated with diffuse metastatic small cell carcinoma in an 87-year-old woman.
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