Final answer:
Scoliosis in the lumbar spine is characterized by an abnormal lateral curvature, often with a convexity to the right or left. It is most common among adolescent girls and may require treatment with a back brace or surgery in severe instances.
Step-by-step explanation:
Scoliosis in the lumbar spine is usually convex to the right or left, depending on the individual case. This condition is characterized by an abnormal lateral curvature of the vertebral column, which can cause the spine to twist and can lead to compensatory curves in other areas of the spine to help maintain a balanced posture. Common among adolescent girls, scoliosis can result from various causes including muscle weakness, bone anomalies, or limb length discrepancies. Treatment options vary, ranging from back braces to surgery in severe cases.