Hallermann-Streiff syndrome is a rare inherited disorder affecting an equal number of males and females. More than 150 cases have been reported in the medical literature, and no known cause has been found other than most likely a new spontaneous genetic mutation. Hallermann- Streiff syndrome is typically diagnosed shortly after birth and usually by the identification of small eyes. Characteristic facial features, premature development of teeth, or deficiency of hair on the face and on the head may also help to confirm the presence of this disorder. Other features be¬ come more apparent as the child begins to age.