A 49-year-old man presented with elevated serum creatinine. He had histories of pancreatic pseudocyst caused by alcoholic pancreatitis and right nephrectomy due to renal cell carcinoma. Computed tomographic scan demonstrated that a subcapsular renal cyst appeared adjacent to the pancreatic pseudocyst and compressed the parenchyma of the left kidney. Since the renal subcapsular cyst was suspected to directly communicate with the pancreatic pseudocyst, endoscopic ultrasound-guided transgastric drainage of pancreatic pseudocyst was performed. After the intervention, the renal subcapsular cyst disappeared without formation of a pancreatic fistula and renal dysfunction was promptly improved. He remains free of relapse for more than 1 year.