Clear Cell Renal Cell Carcinoma in a 60-Year-Old Man Arising From Congenital Left-Sided Ectopic Right Kidney (Crossed Fused Renal Ectopia) With Invasion Into the Contralateral Kidney

Key Points

• To explore the case of clear cell renal cell carcinoma arising from a congenital ectopic kidney.
• Case report of a 60-year-old man with renal pathology.
• Examination of the tumor's origin and invasion patterns.
• Analysis of kidney anatomy and congenital abnormalities.
• The tumor originated from a congenital left-sided ectopic right kidney.
• Significant invasion into the contralateral kidney was observed.
• Unique presentation due to crossed fused renal ectopia was highlighted.