in the age of onset , sex ratio , symptoms and a favorable prognosis in terms of life , a group of etiologically diverse conditions called heller 's syndrome differs from adult dementias and appears classifiable in pervasive developmental disorders according to dsm-iii or dsm-iii-r , even though its validity as a clinical syndrome remains to be studied .
C0236791
heller 's syndrome
C0524528
pervasive developmental