1. 
   Allan Herndon Dudley Syndrome
   An extremely rare condition that is only known to affect approximately 25 people in the entire world. Researchers believe that a X-linked trait is the cause and therefore, only males experience the disorder. People that suffer from this disorder are severely mentally retarded and have a hard time sp...
   Found op http://www.pregnology.com/AZ/A/4
   
   
2. 
   Allan–Herndon–Dudley syndrome
   Allan–Herndon–Dudley syndrome is a rare disorder of brain development that causes moderate to severe mental retardation and problems with movement. This condition, which occurs almost exclusively in males, disrupts development from before birth. It is named eponymously for William Allan, Floren...
   Found op http://en.wikipedia.org/wiki/Allan–Herndon–Dudley_syndrome
   
   

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