The ABC annotation method documents which dimension?

• A. Depth
• B. Width
• C. Height
• D. Volume

Answer: (A)

The main idea here is that the ABC annotation method standardizes how lesion size is recorded along the three orthogonal axes of an ultrasound image, with depth being the dimension assigned to the distance from the skin surface into the breast tissue. Depth is emphasized because it follows the axis along which the ultrasound beam travels from the transducer, making it a stable reference point that remains consistent across views and over time. The other two dimensions describe the lesion’s extent in the transverse (width) and longitudinal (height) directions on the image, but depth is the dimension that ABC explicitly documents. That standardization helps clinicians track changes in location and size accurately during follow-up.