The tumor lysis syndrome represents a potentially lethal complication caused by the massive release of nucleic acids, potassium and phosphate into the circulation as a result of the lysis of neoplastic cells, which are characterized by a rapid proliferation capacity and high sensitivity to drugs. This may occur spontaneously prior to the start of treatment, becoming worse after the initiation of chemotherapy. It presents a high mortality; its prevention continues being the most important

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... utic measure. The clinical picture is characterized by the existence of hydroelectrolytic metabolism disorders, in particular hyperkalemia, hyperphosphatemia and hyperuricemia and by the appearance of an acute renal lesion. Adequate therapeutic intervention involves intravenous hydration and measures to prevent or correct metabolic alterations. This article proposes guidelines to follow both in the diagnostic stage and in the treatment of this complication.