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Sideroblastic anemia secondary to zinc toxicity

Sideroblastic anemia secondary to zinc toxicity
#00019948
Author: Jawad Sheqwara and Yaser Alkhatib
Category: Red Cell: Disorders of Iron Metabolism and Heme Synthesis > Sideroblastic anemias > Acquired/Reversible Sideroblastic Anemias > Copper deficiency
Published Date: 07/18/2013

A 52-year-old African-American woman with a history of allergic rhinitis and alcohol abuse presented with a presyncope. The following levels were found: hemoglobin, 3.7 g/dL; mean cell volume, 82 fL; white blood cell count, 9.2 × 103/µL; and platelets, 168 × 103/µL. The workup was negative for hemolysis or bleeding. Her blood alcohol level was normal. B12 and folate levels were normal. A peripheral smear showed dimorphic red blood cells with Pappenheimer bodies (panel A). A bone marrow biopsy showed slightly hypercellular marrow with intact trilineage hematopoiesis and mild erythroid dyspoiesis. An iron stain showed adequate iron content and occasional ring sideroblasts (panel B). Marrow morphology and cytogenetic analysis did not support a myelodysplastic syndrome. Copper and ceruloplasmin levels were low at 515 µg/L and 16 mg/dL (normal ranges, 810-1990 µg/L and 20-60 mg/dL), respectively. The zinc level was elevated at 186 µg/dL (normal range, 60-130 µg/dL). The patient admitted to self-treating her chronic cough with zinc lozenges for the last 4 months. Our impression was that sideroblastic anemia caused by copper deficiency induced by zinc lozenge use was a significant component of the severe anemia. Zinc lozenges were discontinued, and copper supplements were initiated, with complete hematologic recovery in 4 weeks.