Focal Segmental Glomerulosclerosis Associated with Essential Thrombocythemia
INTERNAL MEDICINE(2023)
Abstract
A 72-year-old man was admitted for examination of proteinuria (9.14 g/day) and leg edema. Essential thrombocythemia (ET) was diagnosed because of thrombocytosis (platelet count, 57.9x104/& mu;L), elevated megakaryocytes in bone marrow biopsy, and JAK2 V617 mutation. Kidney biopsy led to a diagnosis of focal segmental glomerulosclerosis (FSGS) cellular variant (characterized by glomerular capillaries filled with swollen endothelial cells containing foam cells) in 6 glomeruli, FSGS tip variant in 5 glomeruli, and additional FSGS variants in other glomeruli. Affected glomeruli had anti-CD61 antibody staining-positive megakaryocyte infiltrations. ET may induce FSGS because megakaryocyte infiltration increases intraglomerular pressure, resulting in hypertension and proteinuria.
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Key words
essential thrombocythemia,nephrotic syndrome,focal segmental glomerulosclerosis
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