NCIt definition : A rare genetic syndrome mapped to chromosome 16p13.3 and associated with mutations
in the CREBBP gene. It is characterized by mental and growth retardation, distinctive
facial features (prominent nose, low-set ears, microcephaly, and small mouth), and
broad thumbs and great toes. Patients are at an increased risk of developing benign
and malignant neoplasms, including nervous system neoplasms and malignant lymphoproliferative
disorders.;