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Noonan syndrome (NS) is a genetic disorder with distinctive physical features and often multiple organ involvement. Bleeding disorders are reported in over half of patients with NS, including thrombocytopenia and platelet dysfunction. Neonatal alloimmune thrombocytopenia (NAIT) is an alloantigenic thrombocytopenia that can present with severe bleeding. Here, we present a case of intracranial hemorrhage and severe thrombocytopenia in a neonate found to have both NAIT and a de novo heterozygous pathogenic variant in  PTPN11 , consistent with Noonan syndrome.

Severe thrombocytopenia and intracranial hemorrhage in a newborn with Noonan syndrome and neonatal alloimmune thrombocytopenia