# Salvage Ultrasound-Guided Robot-Assisted Video-Endoscopic Inguinal Lymphadenectomy (RAVEIL) as a Metastasis-Directed Therapy (MDT) in Oligoprogressive Metastatic Castration-Resistant Prostate Cancer (mCRPC): A Case Report and Review of the Literature

## TL;DR

A robotic surgery called RAVEIL was used to treat a rare case of advanced prostate cancer, successfully delaying disease progression.

## Contribution

This is the first report of robotic salvage lymphadenectomy as a metastasis-directed therapy in oligoprogressive mCRPC.

## Key findings

- Salvage RAVEIL achieved undetectable PSA levels and over 14 months of progression-free survival.
- The procedure was minimally invasive and resulted in only minor complications.
- Histopathology confirmed cancer in one lymph node, validating the procedure's targeting accuracy.

## Abstract

Background: Metastatic castration-resistant prostate cancer (mCRPC) remains challenging due to progression despite androgen deprivation therapy (ADT). Current treatments, including androgen receptor-targeted agents, chemotherapy, bone-targeted agents, and PARP inhibitors, extend survival but face challenges, such as resistance, adverse effects, and limited durability. Metastasis-directed therapies (MDTs), such as stereotactic ablative radiotherapy (SABR), show promise in oligometastatic disease, but their role in oligoprogressive mCRPC is unclear. Salvage lymphadenectomy is rarely pursued due to invasiveness and limited data. This is the first report of robotic surgery as an MDT in this setting, demonstrating the potential of salvage robot-assisted video-endoscopic inguinal lymphadenectomy (RAVEIL) to manage oligoprogressive mCRPC and delay systemic progression. Methods: A 47-year-old male with metastatic hormone-sensitive prostate cancer (Gleason 10) underwent ADT, docetaxel chemotherapy, and radical retropubic prostatectomy with super-extended pelvic and retroperitoneal lymphadenectomy. Upon progression to oligoprogressive mCRPC, 68Ga-PSMA PET/CT detected a single metastatic inguinal lymph node. Salvage RAVEIL was performed using the da Vinci X™ Surgical System, guided by preoperative ultrasound mapping. Results: Histopathology confirmed metastasis in one of the eight excised lymph nodes. The patient achieved undetectable PSA levels and prolonged biochemical progression-free survival. Minor complications (lymphorrhea, cellulitis) resolved without sequelae. No further progression was observed for over 14 months. Conclusions: This case highlights RAVEIL as a viable MDT option for oligoprogressive mCRPC, potentially extending progression-free intervals while minimizing systemic treatment.