About congenital anomalies
Definition of Congenital anomalies: Abnormalities of body structure that originate before birth. Etiology: Genetic: chromosome abnormality : 6% in incidence & autosomal abnormalities and more severe than sex-chromosome. prenatal or postnatal retardation of linear growth, brain growth, mental retardation, and multiple anomalies of early embryogenesis. Single gene defect: 7.5% Isolated: in one organ or system e.g hydrocephalus, microphthalmia, polydactyly. Multiple: multiple organs or systems don't have an embryological relationship. e.g. Meckel syndrome: Autosomal recessive (encephalophy& polydactyly and polycystic kidney. 3. multifactorial: majority of cases. polygenic inheritance of 2 or more genes inclu...