Severe ADAMTS-13 deficiency in childhood

Area of Science:

• Pediatric Hematology
• Rare Diseases
• Microangiopathic Disorders

Background:

• Thrombotic thrombocytopenic purpura (TTP) is a rare, life-threatening microangiopathic disorder.
• Severe deficiency of von Willebrand factor cleaving protease (VWF-CP), ADAMTS-13, causes TTP.
• Pediatric TTP is underrecognized due to unfamiliarity with its varied presentation.

Purpose of the Study:

• To highlight the clinical heterogeneity of TTP in children.
• To emphasize the risk of misdiagnosis and delayed treatment in pediatric TTP.
• To inform pediatricians about diagnosing severe VWF-CP deficiency.

Main Methods:

• Case series presentation of children with severe VWF-CP deficiency.
• Emphasis on clinical presentation and diagnostic challenges.
• Review of differential diagnoses including ITP, Evans syndrome, and HUS.

Main Results:

• Children with severe VWF-CP deficiency exhibit a wide spectrum of symptoms.
• Oligosymptomatic presentations are frequently misdiagnosed as immune thrombocytopenia (ITP) or Evans syndrome.
• Renal involvement can lead to misdiagnosis as hemolytic-uremic syndrome (HUS).

Conclusions:

• Clinical heterogeneity of TTP in children contributes to diagnostic delays.
• Increased awareness among pediatricians is essential for accurate diagnosis.
• Prompt diagnosis and treatment of pediatric TTP are critical for reducing morbidity and mortality.