Intraperitoneal drop metastasis after radiofrequency ablation of pararenal tumor recurrences.

We report the case of a 66-year-old woman who developed intraperitoneal drop metastasis after radiofrequency ablation of recurrent renal cell carcinoma. This patient had undergone multiple nephron-sparing procedures, including radiofrequency ablation to treat local recurrences. At routine follow-up, she was noted to have two intraperitoneal drop metastases, one in the right paracolic gutter and the other in the cul-de-sac of Douglas. The metastases were treated with complete surgical resection. To our knowledge, this is the first reported case of drop metastasis after radiofrequency ablation, drawing attention to the potential complications of this new treatment modality.