Abstract
Typically, tubulointerstitial nephropathy causes acute impairment of renal function, being necessary for diagnosis to take into account all possibilities of acute renal failure. Echography is a key diagnostic test in order to rule out urinary obstruction. Parenchymal causes must be assessed once acute prerenal failure has been considered. Sometimes, renal biopsy is recommended to achieve definitive diagnosis. Differential diagnosis of chronic tubulointerstitial nephropathies is with chronic kidney disease. Echography shows small size kidneys. Diagnosis is achieved once obstructive causes, inherited diseases, nephrosclerosis, diabetic nephropathy and chronic glomerulonephritis have been ruled out.
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