Tryptophan deficiency can lead to a critical shortness of niacin (vitamin B3), causing photosensitive dermatitis and a range of neurologic Card Holders symptoms.The most common cause is severe protein malnutrition.However, in the case we present here, it is caused by a rare genetic disorder (Hartnup disease).
A previously healthy 26-year-old woman presented with a photosensitive skin rash, myoclonic twitching of Accessories hands and mouth, and, ultimately, coma and status epilepticus.Starting treatment with high-dose niacin, even before the suspected diagnosis was confirmed, turned out to be a lifesaving intervention.