Palatoschisis, Schizophrenia and Hypocalcaemia: Phenotypic Expression of 22q11.2 Deletion Syndrome (DiGeorge Syndrome) in an Adult.

22q11.2 deletion syndrome typically presents with congenital cardiac anomalies, immunodeficiencies and hypoparathyroidism. However, clinical findings vary greatly. We present the case of a 56-year-old man, with a history of cleft palate and schizophrenia, who was newly diagnosed with 22q11.2 deletion syndrome during an episode of hypocalcaemia. The syndrome is caused by developmental abnormalities of the embryonic pharyngeal arch system. Treatment of hypocalcaemia with oral calcium and vitamin D is usually sufficient. LEARNING POINTS: 22q11.2 deletion syndrome typically presents with congenital cardiac anomalies, immunodeficiencies and hypoparathyroidism.The syndrome has a variable phenotypic expression and can therefore remain unrecognised in adult patients with mild symptoms.22q11.2 deletion syndrome should be borne in mind, particularly as regards adult psychiatric patients. © EFIM 2021.