PDS also involves improvement of euthyroid goiter in late childhood to early adulthood Whilst NSEVA doesn't. [from GeneReviews]???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A chromosomal abnormality consisting of your absence of one of several copies of chromosome 7 in somatic cells. [from NCI]????? ?????? ?????? ?? ?? ????? ??? ??? ?????. ?? ??