Pfirrmann grade: Meaning in a Radiology Report

Pfirrmann grade

Also written as: Pfirrmann classification, Pfirrmann score

The Pfirrmann grade rates disc wear on spine MRI from I (healthy, bright disc) to V (dark, collapsed disc).

Seen on: MRI

How it reads in a report

The L4-L5 disc shows loss of T2 signal and mild loss of height, Pfirrmann grade IV, with a small posterior bulge.

What it means

The Pfirrmann grade describes how worn a spinal disc looks on T2-weighted MRI images, where water looks bright. A healthy disc has a soft, water-rich center that looks bright, with a clear edge between it and the tougher outer ring. With age and wear, the disc dries out, turns gray and then dark, the edge blurs, and the disc may lose height. Grades run from I (healthy) to V (collapsed).

When it matters

Some disc drying (grade II or III) is very common in adults, including many without back pain. Higher grades mean more advanced wear, but the grade alone does not explain or predict pain well. Doctors read it together with other findings, such as disc bulges, pinched nerves or Modic changes, and with your symptoms and examination. It is most useful for describing discs and comparing them over time.

Questions to ask your doctor

Which discs are affected, and how do their grades compare?
Could the disc wear explain my symptoms, or is it likely incidental?
Are there other findings, like a pinched nerve, that matter more?

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.