Final answer:
A lateral chest radiograph of a child considers the sagittal plane to provide a side view of the chest, useful for diagnosing conditions like scoliosis.
Step-by-step explanation:
For a lateral chest radiograph of a child, the anatomical plane considered is the sagittal plane. This type of imaging is conducted to capture a side view of the chest, which is essential for evaluating the structure and conditions of the chest, including the lungs, heart, and chest wall. Using the sagittal plane allows clinicians to observe potential abnormalities or issues such as lateral curvature of the spine, also known as scoliosis, and other conditions that might not be as easily observable in other planes.