Adenoid cystic carcinoma of the breast metastasizing to the kidney : a case report
Adenoid cystic carcinoma (ACC) of the breast is a rare histologic type of breast cancer usually associated with a good prognosis. According to the data from the English literature only one case with metastasis to the kidney was previously described. A 76-year-old female patient presented with painless hematuria. Clinical examination showed a mass in the right kidney. Nephrectomy was performed. We received kidney with a multinodular tumor measuring up to 6 cm. Renal capsule, blood vessels and pyelon were not affected. Pathohistological analysis revealed mucinous, tubular tumor suggesting adenoid cystic carcinoma similar to those originating from salivary glands. Further examination disclosed that the patient underwent the surgery five years earlier due to breast tumor that was diagnosed as adenoid cystic carcinoma. Additional examination by immunohistochemistry was consistent with the diagnosis of ACC. Metastatic tumors to the kidney are very rare, especially symptomatic ones. However, one should always consider such possibility in the differential diagnosis of unusual and unclassified renal tumors.