Vaginal bleeding as a rare presentation of metastatic renal cell carcinoma: Case report and literature review.

INTRODUCTION AND IMPORTANCE: Renal cell carcinoma (RCC) is a relatively uncommon malignancy, comprising only 3 % of adult cancers, but it is responsible for 85 % of primary renal tumors. When RCC metastasizes, the most common sites are the lungs, liver, bones, and brain. Although it is rare, RCC can also metastasize to the vagina. About 18-33 % of RCC cases are diagnosed with metastasis at the time of initial diagnosis.

CASE PRESENTATION: A 48-year-old woman presented with postcoital bleeding and dyspareunia. At the physical examination, a polypoid mass was discovered on the right lateral wall of the upper third of her vagina and CT scan showed a right renal. Biopsies revealed clear cell renal carcinoma with metastasis to the vagina. The patient was diagnosed with stage IV (T3cN2 M1) renal cancer and underwent systemic therapy with Everolimus. However, subsequent imaging showed tumor progression, and the patient opted to halt treatment and was subsequently lost to follow-up.

CLINICAL DISCUSSION: In the past decade, there have been fewer than ten reported cases of RCC metastasizing to the vagina. Diagnosing vaginal clear cell carcinoma is challenging due to overlapping morphology with clear cell renal cell carcinoma, requiring immunohistochemistry. Treatment of vaginal cancers is challenging due to their rarity, and there is a lack of consensus on the optimal approach due to limited prospective studies.

CONCLUSIONS: Although the occurrence of RCC metastasis to the vagina is very uncommon, it is important to consider the possibility of metastatic RCC in cases of vaginal bleeding or lesions.