De Novo ring chromosome 11 and non-reciprocal translocation of 11p15.3-pter to 21qter in a patient with congenital heart disease

Background Ring chromosome 11[r (11)] is a rare chromosomal abnormality that forms when both arms of chromosome 11 break, and then reunite with each other. Once a ring chromosome forms, the distal ends of both arms of the chromosome are usually lost.