Retrocaval ureter and right ureteropelvic junction obstruction: a case report and literature review - Jiang, Ze-Sheng; Yan, Min-Bo; Lv, Zhuan; He, Ji-Rong; Wen, Wei-Jun; Mai, Chuan-Xin; Tu, Fa-Rong; Li, Jian-Sheng (Frontiers in Medicine, 2025)