Crigler-Najjar Syndrome Type II Diagnosed in a Patient with Jaundice Since Birth

Crigler-Najjar syndrome type II is caused by mutations in the UGT1A1 gene resulting in severely reduced hepatic activity of UDP-glucoronyltransferase - an enzyme required to convert bilirubin into a more soluble form that can then be removed from the body. Absence or severe deficiency of this enzyme can lead to bilirubin accumulation in the body resulting in yellow skin and eyes (jaundice). The earliest signs of this disease can be apparent in the neonatal period. Patients with Crigglar-Najjar syndrome type II respond to phenobarbital therapy which decreases their chances of getting bilirubinemia by 60-70% in 3 weeks. A 17 years old boy presented with the complaint of gastroenteritis. On examination, he was jaundiced and his parents reported that it has been present since birth. He was admitted in the hospital with the differential diagnosis of Gilbert syndrome, but later it was found that the unconjugated bilirubin levels were higher than those required for Gilbert's criteria. We report, herein, an extremely rare case of Crigler-Najjar syndrome type II and how the patient responded to phenobarbital therapy. Periods of fasting, stress and any kind of illness can worsen unconjugated hyperbilirubinemia leading to complications like kernicterus, so higher levels of unconjugated bilirubin should be addressed immediately and the patient along with his/her family should be educated about this disease.