case_images: PMC11813748_01
case_images: Contrast-enhanced computed tomography (CT) images of the neck and chest reveal a large nodule with areas of cystic degeneration within the right lobe of the thyroid gland. The yellow arrow indicates a tumor thrombus obstructing the right internal jugular vein (IJV).
case_images: fendo-16-1505800-g001.jpg
case_images: PMC11813748_01_fendo-16-1505800-g001.jpg
case_images: f1
case_images: Additionally, an 8 mm lymph node in the right upper lobe of the lung was noted, raising suspicion for metastasis, though there was no evidence of pericardial or pleural effusion ( Figure 1 ).
case_images: Histopathological examination revealed papillary thyroid carcinoma with a predominantly follicular growth pattern, along with areas consistent with poorly differentiated carcinoma. Vascular invasion was observed in a large vessel identified as the internal jugular vein, which contained a tumor thrombus (H&E staining; (A) x10 magnification, (B) x60 magnification).
case_images: fendo-16-1505800-g002.jpg
case_images: PMC11813748_01_fendo-16-1505800-g002.jpg
case_images: f2
case_images: The IJV showed a tumor thrombus with fragments of PTC ( Figure 2 ).