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case_images: (A, B) The venous-phase CT displayed the dilated IVC, seemingly dipping into a slightly enhanced tumor mass invading the right hepatic lobe vein. (C, D) The cinematic three-dimensional rendering clearly depicted the tumor size and extent (blue), with the superior margin close to the right atrium entrance and the lower margin at the level of the left renal vein.
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case_images: A subsequent contrast-enhanced CT scan of the liver uncovered a tumor mass within the dilated IVC, providing visual evidence in  Figures 1A, B . CT angiography indicated the potential presence of right ovarian vein thrombosis. CT cinematic rendering generated a three-dimensional representation, effectively illustrating the size and extent of the IVC tumor ( Figures 1C, D ).
case_images: (A, B) The contrast-enhanced T1WI revealed the IVC tumor infiltrating the right hepatic lobe vein and vessel wall, along with the indistinct boundary (white arrowheads) between the right adrenal gland and the tumor. (C) The axial DWI distinctly showed the IVC tumor with a high signal. (D) The mass exhibiting progressive and heterogeneous enhancement was presented using coronal contrast-enhanced T1WI.
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case_images: The abdominal MRI examination provided clear evidence of the primary IVC tumor infiltrating the right hepatic vein and breaching the vessel walls, as depicted in  Figure 2 .
case_images: (A) The overall appearance of the resected specimen, which consisted of the right liver lobe and IVC tumor. (B) H&E stained pathological tissue section. Postoperative pathology demonstrated proliferative spindle-like cells with atypical nuclei (H&E, x200).
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case_images: The tumor size measured 8cm x 6cm x 5cm, as depicted in  Figure 3A . Pathological examination confirmed primary IVC leiomyosarcoma infiltrating all vessel wall layers without invading surrounding tissues, as depicted in  Figure 3B .