To the Editor.—Crossed renal ectopia, the complete congenital displacement of one kidney to the contralateral side, is a rare radiologic finding, previously reported in the urologic, rather than general surgical, literature. Pseudo—crossed renal ectopia refers to the acquired displacement of the kidney to the other side. A frequent cause of pseudo—crossed renal ectopia is the insidious growth of a retroperitoneal tumor.
Fig 1.—Intravenous pyelogram showing left kidney displaced to right.
Fig 2.—Large retroperitoneal tumor displacing left colon.
Report of a Case.—A 51-year-old woman was admitted to Baptist Medical Center—Montclair (Ala) complaining of slowly increasing abdominal girth and discomfort. Abdominal examination revealed a mass and ascites. An intravenous pyelogram (Fig 1) demonstrated complete displacement of the left kidney to the right side. Laparotomy disclosed an extremely large retroperitoneal tumor arising from the left perinephric tissues, displacing the left kidney and adrenal gland as well as the left