Bladder metastasis from type 2 papillary renal cell carcinoma: A case report.

Renal cell carcinoma (RCC) is a common urinary tumor that may be pathologically divided into different subtypes: clear cell RCC, papillary RCC (PRCC) and chromophobe RCC. The most common organs of RCC metastasis are the lung, liver and bones, while bladder metastasis is rare. The treatment for PRCC metastasis is also a problem due to limited clinical data. Therefore, every single case of PRCC metastasis may significantly contribute to establishing a standard treatment protocol. The present study reported on a patient who suffered from repetitive bladder PRCC metastasis with 1.5 years of follow-up. A 54-year-old male patient was diagnosed with left renal pelvic carcinoma in March 2020 and underwent a laparoscopic radical nephroureterectomy of the left kidney. The postoperative histological examination revealed that the tumor was consistent with a type 2 PRCC. Bladder metastasis was discovered three months after the surgery and transurethral resection of the bladder tumor (TURBT) was performed to eliminate the tumor in the bladder. Only three months after the initial TURBT, bladder metastasis was detected again, combined with lung metastasis. The patient refused to undergo radical cystectomy. Therefore, a second TURBT was arranged and targeted drugs were administered. However, both bladder and lung metastases were insensitive to the treatment strategy applied, although immunotherapy was subsequently added. The patient died in October 2021 due to respiratory failure and cachexia. The report aims to provide the whole treatment progress and lessons learned from this case, which is relatively rare.