Double kidney
| Classification according to ICD-10 | |
|---|---|
| Q63.1 | Lobed kidney, fused kidney, and horseshoe kidney |
| ICD-10 online (WHO version 2019) | |
As kidney grille in medicine, the twin system is a gland called. This is the most common developmental disorder of the urinary tract, in which parts of the kidney system are incompletely fused, with the ureteral bud splitting, i.e. actually a double system of the hollow system, see renal pelvis . A distinction can be made between unilateral and bilateral double kidneys, depending on whether only one kidney or whether both kidneys are present in a double system.
The relevance of a double system results from how the urine can flow out of this additional renal pelvis. Are eligible:
- Unification of both renal pelvis outside the kidney "extrarenally" to form a common pelvis with a common ureter ("deep division of the renal pelvis").
- Two ureters that join together to form a common end segment (" ureter fissus ").
- Two ureters with two separate openings into the urinary bladder. The ureter of the lower appendix opens into the urinary bladder at the usual place "orthotopically", that of the upper appendix further caudally "dystop".
- The dystopic ureter forms a ureterocele .
- The dystopic ureter forms a stenosis (distal ureter stenosis ).
- The dystopic ureter opens distal to the bladder sphincter , see ureter ectopia .
Only in the first two cases (deep division and ureter fissus) do double kidneys remain asymptomatic and are therefore often incidental findings of sonography. In all other cases, reflux or distal ureteral stenosis occurs, each with a urinary tract infection . In the last case of the list, urination occurs.
In the differential diagnosis of a (one-sided) kidney enlargement, in addition to the possibility of a double kidney, compensatory hypertrophy, malignancies and cysts must also be considered.
Individual evidence
- ^ Pschyrembel : Clinical Dictionary
- ↑ M. Bettex, N. Genton, M. Stockmann (Ed.): Pediatric surgery. Diagnostics, indication, therapy, prognosis. 2nd edition, Thieme 1982
- ↑ C. Weigert: "About some errors in the formation of the ureters." Virchow's archive of pathological anatomy 70 (1877)
literature
- V. Hofmann, KH Deeg, PF Hoyer: Ultrasound diagnostics in pediatrics and pediatric surgery. Textbook and atlas. Thieme 2005, ISBN 3-13-100953-5 .
- W. Schuster, D. Färber (Ed.): Children's radiology. Imaging diagnostics. Springer 1996, ISBN 3-540-60224-0
- FC Sitzmann: Pediatrics. Diagnostics - therapy - prophylaxis. 6th edition, Hippocrates 1988, ISBN 3-7773-0827-7 .
