Urologie pro praxi 2/2026

Urothelial carcinoma of horseshoe kidney with tumor triplicity – clinical presentation and treatment approach

Horseshoe kidney (ren arcuatus) represents the most common renal fusion anomaly, occurring in approximately 1 in 400–1,800 individuals. It is generally a benign condition, yet predisposes patients to multiple urological complications, including an increased risk of neoplastic diseases. Urothelial carcinoma arising in a horseshoe kidney is exceedingly rare, complicating both its diagnosis and management. This case report presents an 81-year-old patient with high-grade invasive urothelial carcinoma located in the isthmus of a horseshoe kidney, further complicated by concurrent small lymphocytic lymphoma (CLL/SLL). Diagnosis required an open surgical biopsy, and the patient subsequently underwent radical tumour resection with extensive lymphadenectomy. This case illustrates the necessity for multidisciplinary cooperation and careful surgical planning in managing malignancies in anatomically atypical conditions.

Keywords: horseshoe kidney, ren arcuatus, kidney tumour, tumour triplicity.