Final answer:
The best position to scan the lateral breast is the lateral decubitus position.
Step-by-step explanation:
The best position to scan the lateral breast is the lateral decubitus position. In this position, the patient lies on their side with the arm above the head and the breast to be scanned positioned on the table surface. The breast is then compressed between the table and the imaging device, such as a mammography machine or ultrasound probe, to obtain high-quality images.