Primary Large-Cell Undifferentiated Carcinoma of the Ureter.

Objective: To report the first case in the literature of a primary large-cell undifferentiated carcinoma (LCUC) of the ureter with a very aggressive behavior and dismal prognosis.

Clinical Presentation And Intervention: A 60-year-old woman with a history of intermittent macroscopic hematuria and mild to moderate right flank pain was admitted to the Department of Urology. Tissue biopsies and cytological samples were taken. Pathologic examination was consistent with LCUC.

Conclusion: LCUC of the ureter is an aggressive tumor with a high proliferation index. Patients might be diagnosed at an advanced stage. LCUC must be considered in the differential diagnosis of urinary tract pathologies.