Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders

This chapter includes structural abnormalities and genetic conditions present at birth, even if they are diagnosed later in life. It covers congenital malformations of the nervous system, heart, digestive tract, musculoskeletal system, and other organs. Chromosomal abnormalities such as trisomies are included, as well as inherited genetic syndromes. Structural defects may range from minor anomalies to life-threatening malformations.
Conditions are organized primarily by affected organ system. The chapter distinguishes between isolated malformations and syndromic conditions involving multiple systems. These diagnoses are important for pediatric care, genetic counseling, surgical planning, and long-term developmental monitoring. Because many congenital conditions require lifelong management, accurate documentation supports continuity of care and epidemiological research into birth defect prevalence.