An uncommon manifestation of breast cancer is ureteral obstruction secondary to metastatic disease. Five patients who recently developed this complication from two to 20 years after the diagnosis of breast cancer are described. Only two of the five patients had urinary symptoms. All of the patients were older, postmenopausal females who had bone metastases and all had responded to previous hormonal manipulation. Bone scanning was useful in detecting unsuspected hydronephrosis in two patients. Retroperitoneal disease appears to be a complication of long standing breast cancer which is usually hormonally dependent. Routine examination of the bone scan for renal asymmetry may aid in the diagnosis, especially in asymptomatic patients.
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