Hisao is a male high school student diagnosed with chronic cardiac dysrhythmia and congenital heart muscle deficiency.

In the case of a five fingered-hand it has a finger-like appearance, with the position in the plane of the four fingers, thenar muscle deficiency, and additional length.

Other names for the syndrome include Abdominal Muscle Deficiency Syndrome, Congenital Absence of the Abdominal Muscles, Eagle-Barrett Syndrome, Obrinsky Syndrome, Fröhlich Syndrome, or rarely, Triad Syndrome.