Synchronous Duodenal and Pancreatic Metastases From Clear Cell Renal Cell Carcinoma 18 Years After Nephrectomy: A Case Report - Ankit Kulkarni; Suhail Sapkota; Sai Sushrutha Mudupula Vemula; Shreya Motkur; Adarsh Jha; Rutwik Pradeep Sharma; Sumugdha Rayamajhi (Clinical Case Reports, 2026)