A rare neurologic disease characterised by lethargy, hypotonia, poor feeding, opisthotonus and a typical high-pitched cry due to bilirubin accumulation in the globus pallidus, sub-thalamic nuclei, and other brain regions, resulting from severe neonatal unconjugated hyperbilirubinaemia. Onset of symptoms is typically within the first three to five days of life. Additional features include fever, apnoea, seizures and coma. Respiratory failure or refractory seizures may lead to a fatal outcome. [from
SNOMEDCT_US]