Disc protrusion: Meaning in a Radiology Report

Also written as: focal protrusion, broad-based protrusion, protruded disc, disk protrusion

A disc protrusion is a common type of disc herniation: disc material pushes out in one area, but its base stays wider than the part sticking out.

What it means

Discs have a tough outer ring and a softer center. In a protrusion, disc material pushes past the disc's normal edge in one limited area, unlike a bulge, which spreads around much of the rim. The part sticking out is narrower than where it joins the disc, so it looks like a low mound. Reports also say where it points: central, paracentral (just off center) or foraminal (toward a nerve exit).

When it matters

Protrusions are often found in people with no pain at all. The finding matters most when it touches or presses on a nerve root that fits your symptoms, such as pain, tingling or weakness down one leg or arm. Symptoms from a protrusion often settle over weeks to months. Doctors match the level and side with your exam, and a repeat scan is usually only needed if symptoms persist or worsen.

Questions to ask your doctor

Is the protrusion touching a nerve root, and if so, which one?
Do the side and level fit where I feel pain or numbness?
If my symptoms settle, will I still need another scan?

General information, not medical advice. What a finding means for you depends on your symptoms, your history and the images themselves, so talk your results through with a doctor.