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Intravascular extension of malignancy is rare. Some cases of this have been reported, and these have mostly been seen in cases of lung cancer with extension into the pulmonary vein and left atrium. This is the first case of tumor involvement from the right atrium through the SVC to the azygous vein of the diaphragm level and all this was clearly visualized on 18 FDG-PET/CT. A 68-year-old man was admitted for evaluation of SVC syndrome. Chest CT showed that the SVC was near completely obstructed by extension of tumor that had first invaded the thoracic spine and azygous vein. Multiple enlarged mediastinal lymph nodes were also noted. The pathologic examination of the biopsied tissues made the diagnosis of sarcomatoid carcinoma. The high metabolic activity within a thrombus on 18 FDG-PET/CT has been suggested to indicate tumor thrombus because a blood thrombus typically shows lower metabolic activity that’s caused by incorporated fibroblasts and endothelial cells within the thrombus (1). However, because some reports demonstrated that a high FDG uptake could also occur in a blood thrombus (2), the exact differentiation of the two by 18 FDG-PET/CT seems to be difficult. (J Lung

Visualization of the Vascular Course from the Right Atrium through the SVC to the Azygous Vein on18FDG-PET/CT

Visualization of the Vascular Course from the Right Atrium through the SVC to the Azygous Vein on¹⁸FDG-PET/CT