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A 16-year-old boy with severe hemophilia B and minimal bleeding manifestations in his early childhood presented with gastrointestinal bleeding at 11 years of age. Following administration of prothrombin complex concentrate, he developed peripheral venous thrombosis and cerebral sinovenous thrombosis, posing a management dilemma. His cerebral sinovenous thrombosis resolved spontaneously, proving watchful waiting to be a useful strategy. He developed spontaneous intracranial bleed at 14 years of age for which he was treated with factor IX concentrate and commenced on prophylaxis. We discuss the factors contributing to genotype-phenotype dissonance in severe hemophilia and considerations before commencing prophylaxis in such cases. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.


Mei Ching Goh, Joyce Ching Mei Lam, Ah Moy Tan, Rajat Bhattacharyya. Bleeder With a Clot: Thrombosis Following Treatment of Bleeding in a Child With Severe Hemophilia B. Journal of pediatric hematology/oncology. 2021 May 01;43(4):e561-e563

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PMID: 32769563

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