High-dose-rate brachytherapy of recurrent rectal adenocarcinoma presenting as a solitary intravascular metastasis of the iliac vein: a case report.

Purpose: To describe a novel use of high-dose-rate intravascular brachytherapy in the first reported case of macroscopic metastatic rectal adenocarcinoma within a peripheral vein.

Methods And Materials: Following thrombolytic therapy to ablate an overlying venous thrombosis, a vascular stent was deployed across the entire length of the tumor. Using the stent as a target, 4300 cGy was delivered to the tumor via megavoltage external beam radiation.