Two cases of lung metastasis originating from acquired cystic kidney disease associated carcinoma
Case 1 involved a 70 year old man on hemodialysis for chronic nephritis for 19 years, who had undergone left nephrectomy for acquired cystic kidney disease (ACKD) associated renal cell carcinoma (RCC) (pT2aN0M0; stage II) 5 years earlier. An abnormal pulmonary nodule was detected on follow up chest computed tomography (CT) We performed wedge resection of the right lower lobe, and diagnosed metastatic lung tumor originating from ACKDassociated RCC histopathologically. Case 2 involved a 52 year old man on hemodialysis for diabetic nephropathy for 14 years, who had undergone bilateral nephrectomy for ACKD associated RCC (pT2aN0M0; stage II) 1 year earlier. An abnormal pulmonary nodule was detected on follow up CT. We performed wedge resection of the right lower lobe, and diagnosed metastatic lung tumor originating from ACKD associated RCC histopathologically. Although the prognosis of ACKD associated RCC is favorable and lung metastasis is rare, annual systemic screening appears important for good prognosis.