What it means
A healthy disc's soft center is mostly water, which makes it look bright on T2-weighted MRI. Over the years, discs slowly dry out, and their centers turn gray or dark on these images. Desiccation simply names that drying. A drier disc is a little less springy and may gradually lose height. It is one of the earliest and mildest signs of disc wear.
When it matters
Desiccation is extremely common. It can start in your 20s or 30s and becomes more frequent with each decade, often in people with no back pain. On its own it rarely changes what happens next. Doctors pay more attention when it comes with other changes at the same level, such as a herniation or narrowing around a nerve, that fit your symptoms.
Questions to ask your doctor
- How many discs show desiccation, and is that usual for my age?
- Is there any bulge or herniation at the desiccated levels?
- Could these disc changes be related to my symptoms?
