Nephroblastomatosis
The presence of multiple embryonic rests of tissue within the kidney. These nephrogenic rests usually are benign but they may give rise to Wilms tumor. Chemotherapy has been advocated if the rests are growing or if a child becomes symptomatic to decrease the risk of development of Wilms tumor.
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- Nephrocalcinosis
the excess excretion of calcium by the kidney, renal tubular acidosis, medullary sponge kidney, hypercalcemia (high calcium levels in the blood), renal cortical necrosis, and tuberculosis. Nephrocalcinosis is relatively common in premature infants, partly from intrinsic kidney calcium losses and partly from enhanced calcium excretion when they are given diuretics. Other causes include hyperparathyroidism, sarcoidosis, […]
- Nephrogenic rest
A fragment of embryonic tissue in the kidney retained after the period of embryonic development. Nephrogenic rests are precursors (forerunners) of Wilms tumor. Two distinct categories of nephrogenic rest are recognized on the basis of their topographical relation to the renal lobe. Intralobar nephrogenic rests occur within the renal lobe and develop as the result […]
- Nephrolithiasis
calculi) is the Latin word for pebble.
- Nephrolithotripsy, percutaneous (PNL)
A technique for removing large and/or dense stones and staghorn stones. PNL is done via a port created by puncturing the kidney through the skin and enlarging the access port to 1 cm (about 3/8 inch) in diameter. There is no surgical incision. PNL is done under anesthesia and real-time live x-ray control (fluoroscopy). Because […]
- Nephrologist
A physician specializing in treating diseases of the kidneys.