ABSTRACT
The long-term retention of ureteral stent (double J tube) leads to the displacement and fracture of double J tube, and the formation of peritube stones, which are the main causes of the difficult decannulation through conventional cystoscopy. Its clinical treatment is more complex, involving different minimally invasive endoscopic techniques, and even by traditional open surgery. In recent years, more and more reports on the difficulty of removing double J tubes after retention. Among them, the multi-mirror combined operation method has been recommended, and the KUB scoring system based on imaging examination contributes to evaluate the difficulty of operation and prognosis of patients before operation. This article reviews the diagnosis of double J tube retention, the causes of difficult decannulation, preoperative preparation and progress of surgical management.