Autoimmune hemolytic anemia with Donath–Landsteiner antibody: A rare case report

Paroxysmal cold hemoglobinuria (PCH) is a rare autoimmune hemolytic anemia characterized by the abrupt onset of hemoglobinuria and anemia, typically following exposure to cold temperatures. The pathogenesis of PCH is primarily associated with the presence of a unique autoantibody known as the Donath–Landsteiner antibody, a biphasic hemolysin (immunoglobulin G) with specificity for P blood group antigens. This rare clinical entity can manifest at any age; however, in children, it typically follows a viral upper respiratory tract infection or immunization. We hereby report a rare case of PCH in a 3-year-old boy who presented at our hospital with severe anemia along with liver and renal dysfunction.