A longitudinal scan displays which extent of a lesion?

In a longitudinal scan, the focus is primarily on the length and depth of the structure being evaluated, which includes providing information about the anterior-posterior extent of a lesion. This orientation allows for a clear view of how deep the lesion penetrates into the surrounding tissues and its overall length from the front (anterior) to the back (posterior).

Understanding the anterior-posterior extent is crucial in diagnosing and planning treatment for various ocular conditions, as it can indicate the severity and potential impact of the lesion on adjacent anatomical structures. The longitudinal view enables sonographers to assess the full dimensions of a lesion, particularly how far it extends from the surface toward deeper tissues, which is vital for medical decision-making.

In contrast, other dimensions such as lateral, medial, or vertical extents are not the primary focus of a longitudinal scan, which specifically captures that anterior-posterior relationship, making the determination of depth and length essential for accurate assessment and treatment planning.