Snapshot A 3-year-old boy with a history of seizure disorder and developmental delay is referred to a geneticist for consideration of genetic testing. His pediatrician noticed that he is very hyperexcitable and is constantly laughing and smiling. His parents also report poor feeding, sleep disturbance, and incessant hand flapping and tremors. He is currently taking an anti-epileptic medication as well as melatonin for sleep. His family history is negative for any developmental disorders. Introduction Overview login to view 2 more bullets Epidemiology Incidence login to view 1 more bullet ETIOLOGY Pathogenesis login to view 3 more bullets Genetics login to view 6 more bullets Associated conditions login to view 2 more bullets Presentation Symptoms login to view 10 more bullets Physical exam login to view 8 more bullets Imaging Radiograph login to view 4 more bullets Studies Genetic testing login to view 2 more bullets Differential Prader-Willi syndrome login to view 3 more bullets Treatment Lifestyle login to view 3 more bullets Medical login to view 6 more bullets Complications Seizure disorder Prognosis Good prognosis with ability to function