De novo NSD1 mutation leading to Sotos syndrome – First case report from Oman

Multiple factors control the growth of a child, including genetics, nutrition, and socioeconomic factors. Referral of tallboys who are otherwise well is very rare. However, sometimes, extraordinary tall stature for the age can be a cause of great concern to the parents. We report a case of an Omani child with a de novo mutation of NSD1 that led to his overgrowth and diagnosis of Sotos syndrome (SoS). This syndrome is a rare genetic disorder. Only two cases of genetically proven diagnosis were reported from the Middle East and North Africa region. Therefore, we describe a case and highlight the comorbidities associated with this condition, encouraging colleagues from the region to report their cases to understand better the phenotype–genotype and the natural history of this disorder in this part of the world.