Differentiate between a disk bulge and a disk protrusion in terms of morphology and clinical significance.

A disk bulge involves a broad-based extension of the disk material, typically affecting more than 25% of the disk circumference, often due to bulging of the annulus fibrosus. A disk protrusion is a focal extension of the disk material, involving less than 25% of the disk circumference, usually due to herniation of the nucleus pulposus. Key diagnostic features include the extent and symmetry of the disk material beyond the vertebral body. Clinically, a bulge may be asymptomatic or cause diffuse symptoms, while a protrusion is more likely to impinge on nerve roots, leading to radicular symptoms. Pitfalls include confusing a bulge with age-related changes or a protrusion with more severe herniations.