“…2 We found no previous reports of hydronephrosis caused by an intra-abdominal abscess from cecal perforation by an ingested fish bone, although we did find a case of hydronephrosis caused by appendiceal abscess that had resulted from migration of an ingested metallic pin, 3 as well as 36 cases of hydronephrosis complicating peritonitis, appendicitis, or appendiceal abscess. [4][5][6][7][8][9][10] In the 38 cases of hydronephrosis caused by intraabdominal inflammation including the present case, treatment typically was drainage of any abscess present with or without bowel resection, or conservative therapy with antibiotics; [3][4][5][6][7][8] while only three patients required resection and reconstruction of an involved ureter because of severe adhesions or suspicion of cancer. 9,10 In most cases hydronephrosis resolved spontaneously after treatment for abscess.…”