Ever since firstly reported by Zimskind and collegue in 1967,1 double-J ureteral catheter (DBJ) has become one of the most commonly used treatment modalities for internal drainage after endourological procedures. It was proven an effective method for post-operative treatment of ureteral calculi, ureteral stricture, congenital anomaly, ureteral or retroperitoneal tumor, or iatrogenic ureteral injury.2 However useful it may be, the complications of an indwelling DBJ should be always kept in mind. For example, retrograde migration, breakage, encrustations, stone formation, or occlusion may occur. A forgotten ureteral double-J stent usually resulted in encrustations or stone formations, and became a nightmare of the urologists. Here we reported a case of extremely long DBJ indwelling duration, which leaded to massive encrustations. After a serial managements, the DBJ was completely removed endourologically, and the patient recovered uneventfully. To avoid the morbidity of forgotten DBJ, some feasible and effective preventive methods must be established, such as patient registry system in hospitals.