Gwladys Robinet-Zimmermann1, Nathalie Rioux-Leclercq2, Thierry Frouget3, Cécile Le Naoures2. 1. Service d'anatomie et cytologie pathologiques, CHU Pontchaillou, 2, rue Henri le Guilloux, 35033 Rennes cedex 9, France. Electronic address: gwladys.robinet.zimmermann@chu-rennes.fr. 2. Service d'anatomie et cytologie pathologiques, CHU Pontchaillou, 2, rue Henri le Guilloux, 35033 Rennes cedex 9, France. 3. Service de néphrologie, CHU Pontchaillou, 2, rue Henri le Guilloux, 35033 Rennes cedex 9, France.
Abstract
INTRODUCTION: Lysozyme-induced nephropathy is a rare and unknown complication of chronic myelomonocytic leukemia with overproduction of lysozyme by tumoral cells leading to proximal tubular cells injuries. The present case reports a lysozyme nephropathy secondary to chronic myelomonocytic leukemia. OBSERVATION: We reported a case of a 82-years-old woman who presented an acute renal failure in a context of diarrhea and vomiting. Her background was characterized by untreated chronic myelomonocytic leukemia and high blood pressure. Despite rehydration, renal function deteriorated. Renal biopsy revealed a tubulo-interstitial lysozyme-induced nephropathy with a vacuolization of the tubular epithelium by eosinophilic droplets stained by anti-lysozyme antibody, without tumoral infiltration of the renal parenchyma. CONCLUSION: Lysozyme-induced nephropathy is a rare disease which can be suspected biologically and needs histologic confirmation. Other causes of renal failure secondary to chronic myelomonocytic leukemia have to be eliminated first in these patients. The treatment is symptomatic and is associated with treatments of the underlying hematologic pathology.
INTRODUCTION:Lysozyme-induced nephropathy is a rare and unknown complication of chronic myelomonocytic leukemia with overproduction of lysozyme by tumoral cells leading to proximal tubular cells injuries. The present case reports a lysozymenephropathy secondary to chronic myelomonocytic leukemia. OBSERVATION: We reported a case of a 82-years-old woman who presented an acute renal failure in a context of diarrhea and vomiting. Her background was characterized by untreated chronic myelomonocytic leukemia and high blood pressure. Despite rehydration, renal function deteriorated. Renal biopsy revealed a tubulo-interstitial lysozyme-induced nephropathy with a vacuolization of the tubular epithelium by eosinophilic droplets stained by anti-lysozyme antibody, without tumoral infiltration of the renal parenchyma. CONCLUSION:Lysozyme-induced nephropathy is a rare disease which can be suspected biologically and needs histologic confirmation. Other causes of renal failure secondary to chronic myelomonocytic leukemia have to be eliminated first in these patients. The treatment is symptomatic and is associated with treatments of the underlying hematologic pathology.