# Breast Cancer Metastasis with a Ureteral Obstruction and Bladder Mass

## TL;DR

A rare case of breast cancer metastasis to the bladder in an asymptomatic patient is reported, highlighting unusual clinical features.

## Contribution

This case report adds to the limited literature on bladder metastases from breast cancer with unique clinical characteristics.

## Key findings

- Breast cancer metastasis was identified in the bladder despite the patient being asymptomatic for over a decade.
- The bladder was the solitary site of metastasis, which is uncommon for this cancer type.
- Pathology confirmed the bladder mass as metastatic breast cancer following transurethral resection.

## Abstract

Breast cancer is the most common cause of cancer mortality in females globally, and a significant proportion of patients develop metastatic disease. Common metastatic sites of breast cancer include bone, lung, liver, and brain. Secondary neoplasms (metastases from other primary sites) represent a minority of all malignant bladder tumors

In this report, we describe a case of breast cancer metastasis with ureteral obstruction and bladder mass in a 60-year-old African-American female. For over a decade, this patient was asymptomatic and had been under surveillance following bilateral radical mastectomy for invasive ductal carcinoma (IDC) with adjuvant chemoradiotherapy. Unrelated imaging revealed an incidental finding of right hydronephrosis. Subsequent cystoscopy revealed a bladder mass obstructing the right ureteral orifice. Transurethral resection of a bladder tumor and ureteral stent placement were performed, and the pathology findings favored metastatic breast cancer.

The details of the case are intended to help further knowledge of urinary bladder metastases. This case is unusual in that the patient was asymptomatic, her breast cancer type is associated with a lower incidence of bladder metastases, and the bladder was the solitary location of metastasis.