Final answer:
Idiopathic adolescent scoliosis is a condition where there is an abnormal lateral curvature of the spine in adolescents, typically of unknown cause. It may worsen during growth spurts and can require treatment ranging from bracing to surgery in severe cases.
Step-by-step explanation:
Sonia Grasso's diagnosis of idiopathic adolescent scoliosis best describes her condition as a spinal disorder of unknown origin occurring in adolescence. This condition is characterized by an abnormal lateral curvature of the spine, which may be accompanied by twisting. While the exact cause of scoliosis is often unknown, it may result from factors such as muscle weakness or asymmetrical growth. Scoliosis tends to worsen during adolescent growth spurts, and although some cases do not require intervention, others may necessitate the use of a back brace or even surgery in severe instances.