The possibility of multiple primary malignancies should always be considered during the treatment and follow-up of cancer patients. This case series could prove helpful to clinicians faced with similar, however, exceedingly rare scenarios. Due to the realistic potential for long-term survival, we recommend aggressive treatment of these patients.

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IVC tumor thrombus in patients with WT was managed successfully using preoperative chemotherapy followed by surgery with minimal aggressive approach. Luminal thrombus removal and intimal stripping supplanted by local radio boost when indicated seem to be adequate tools for local control with documented good overall outcomes.

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