Tc-99m mercaptoacetyltriglycine (MAG3) is predominantly a proximal tubular secretion renal agent without cortical fixation indicated for dynamic renal studies to evaluate cortical tubular function and collecting system drainage. Tc-99m MAG3 and is the agent of choice for obstructive uropathy and diffuse functional abnormalities of the renal cortex. The aim of this study was to evaluate by means of Tc-99m MAG3 scintigraphy the acute and subacute impairment of tubular secretion after cisplatin administration in patients with head and neck cancer receiving chemotherapy.