RESUMEN
OBJECTIVE: To report a case with early presentation of acute lymphoblastic leukemia (ALL) as bilateral renal masses and renal failure. CLINICAL PRESENTATION AND INTERVENTION: A 6-year-old boy was admitted with bilaterally enlarged kidneys and severe renal impairment. Magnetic resonance imaging (MRI) showed bilateral renal enlargement with features suggestive of an infiltrative lesion. Accordingly, bone marrow examination was performed, and diagnosis of ALL was made. The patient developed acute renal failure after initiation of chemotherapy, so he received hemodialysis. His renal function normalized and kidney enlargement regressed. CONCLUSION: This case demonstrates an unusual early renal involvement in ALL in a child. MRI is a valuable imaging modality in the evaluation of renal masses.