supernumerary kidney


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su·per·nu·mer·ar·y kid·ney

a kidney, in addition to the two usually present, developed from the splitting of the nephrogenic blastema or from a separate metanephric blastema, into which a partial or complete duplication of the ureteral stalk enters to form a separate, capsulated kidney; in some cases, the separation of the duplicated organ is incomplete.

kidney

either of the two organs in the lumbar region that filter the blood, excreting the end-products of body metabolism in the form of urine, and regulating the concentrations of hydrogen, sodium, potassium, phosphate and other ions in the extracellular fluid. Bean-shaped in the dog, cat, sheep and laboratory animals, lobed in the ox and some fetal animals such as the horse; irregularly lobed in birds. See also renal.
Enlarge picture
Dog kidney. By permission from Sack W, Wensing CJG, Dyce KM, Textbook of Veterinary Anatomy, Saunders, 2002

artificial kidney
an extracorporeal device used as a substitute for nonfunctioning kidneys to remove endogenous metabolites from the blood, or as an emergency measure to remove exogenous poisons such as barbiturates. Called also hemodialyzer.
balloon kidney
meat hygiene term for cystic kidney.
basal lamina kidney
part of the filtration barrier of the kidney; is much thicker than most basal laminae.
cake kidney
a solid, irregularly lobed organ of bizarre shape, formed by fusion of the two renal anlagen. Called also lump kidney.
cicatricial kidney
a shriveled, irregular and scarred kidney due to suppurative pyelonephritis.
contracted kidney
an atrophic kidney that may be scarred and granular.
duplicate kidney
occurs in most species, without apparent increase in total renal mass.
enlarged kidney
may be due to polycystic kidney disease, hydronephrosis, pyelonephritis or congenital absence of one kidney resulting in hypertrophy of the other.
fatty kidney
one affected with fatty degeneration.
floating kidney
one that is freely movable, especially a human kidney (normally more firmly fixed than those in quadrupeds); called also hypermobile kidney. See also nephroptosis.
Enlarge picture
Bovine kidney. By permission from Sack W, Wensing CJG, Dyce KM, Textbook of Veterinary Anatomy, Saunders, 2002
fused kidney
a single anomalous organ developed as a result of fusion of the renal anlagen.
giant kidney worm
Goldblatt kidney
one with obstruction of its blood flow, resulting in renal hypertension. Produced experimentally in dogs.
horseshoe kidney
an anomalous organ resulting from fusion of the corresponding poles of the renal anlagen.
hypermobile kidney
one that is freely movable; called also floating kidney. See also nephroptosis.
lump kidney
cake kidney.
kidney meridian points
acupuncture points on the kidney meridian.
pelvic kidney
a kidney which has failed to ascend from its primordial site to the roof of the abdomen.
polycystic kidney disease
the most common congenital renal defect but most cases are sporadic and do not cause clinical illness because there is still sufficient renal mass to avoid uremia. In some cases the enlarged kidney is detected incidentally during a clinical examination. Rarely both kidneys are badly involved and the animal is dead at birth or dies soon afterwards. In some cases, there are signs of progressive renal failure, perhaps not until later in life. The defect is inherited in Persian cats, Cairn terriers and pigs. In Cairn terriers, cysts may also occur in the liver. See also feline perirenal cysts.
pulpy kidney disease
see Clostridium perfringensenterotoxemia.
kidney scan
radioimaging of a kidney by the use of a rectilinear scanner after the intravenous administration of a radiopaque material.
kidney stones
supernumerary kidney
additional kidneys which develop as a consequence of two ureteric buds arising from one mesonephric duct so that two kidneys develop on the one side.
kidney transplant
commonly and successfully performed in experimental dogs. Increasingly used as a therapeutic procedure in clinical veterinary medicine for renal failure in cats and dogs.
turkey egg kidney
a speckled pattern caused by hemorrhagic glomeruli in diseases such as porcine erysipelas.
wandering kidney
floating or hypermobile kidney. See also nephroptosis.
waxy kidney
amyloid kidney.
white-spotted kidney
focal nonsuppurative interstitial nephritis, seen most commonly in calves.

supernumerary

in excess of the regular number.

supernumerary kidney
an additional kidney which may be fused with or separate from a normal kidney; caused by the formation of an extra ureteric bud in the embryo.
supernumerary teats
in cows may be accompanied by a supernumerary mammary gland. May also be an adjunct to an existing teat and also share its teat cistern.
References in periodicals archive ?
Koureas AP, Panourgias EC, Gouliamos AD, Trakadas SJ; Vlahos LJ; Imaging of supernumerary kidney.
4) Structure Supernumerary kidney Duplex kidney Parenchyma Usually completely Both poles firmly separate, but there may attached to each other.
The histological examination demostrated that this case, presenting two different complete collecting systems differentiated by a own capsule, can be considered a supernumerary kidney.