Document Type : Case Report
                            
                        
                                                    Authors
                            
                                                            
                                                                            1
                                                                        Professor of Pediatric Endocrinology, Department of Pediatrics, School of Medicine, Isfahan University of Medical Sciences, Isfahan                                
                                                            
                                                                            2
                                                                        Associate Professor of Pediatrics, Department of Pediatrics, School of Medicine, Isfahan University of Medical Sciences, Isfahan                                
                                                            
                                                                            3
                                                                        Student of Pediatric Endocrinology, Department of Pediatrics, School of Medicine, Isfahan University of Medical Sciences, Isfahan                                
                                                            
                                                                            4
                                                                        Assistant Professor of Pediatric Endocrinology, Department of Pediatrics, School of Medicine, Isfahan University of Medical Sciences, Isfahan                                
                            
                                                
                        
                            Abstract
                            Background: 
Disorder of sex development (DSD) is defined as a congenital mismatch between sex phenotype, gonadal and sex chromosome, which mainly present with atypical genital appearance or ambiguous genitalia. It consider as a medical emergency and the cases should be evaluate immediately for detection of life threatening conditions and determination of gender.
Case Report: 
We report a 50 days old infant with 49,XXXXY syndrome presenting with ambiguous genitalia.
Conclusion: 
49,XXXXY syndrome is a rare sex chromosome aneuploidy disorder, which represented with its “classical triad” consists of mental retardation, radioulnar synostosis and hypogonadism.
Key words: Disorder of sex development, Ambiguous genitalia, Facial dysmorfism, 49,xxxxy syndrome.