| Term | Definition |
| Malformation | Defects of organs or body parts due to an intrinsically abnormal developmental process |
| Deformation | Abnormalities of the shape and position of body parts due to extrinsic intrauterine mechanical forces that modify a normally formed structure |
| Disruption | Defects of organs or body parts that result from destruction of or interference with normal vascular development |
| Dysplasia | Anomalies that result from the abnormal organization of cells into tissues |
