Fig. 7.

Drawings of a vertebral unit on short tau inversion recovery images. White is bone marrow edema on a background of normal gray fat-suppressed bone marrow. ( a ) Axial spondyloarthritis: single-sided bone marrow edema (BME) at the anterior end plate with a normal hydrated disk. ( b ) Schmorl's node centrally located with a zone of BME: normal hydrated disk. ( c ) Modic type 1 degenerative disk disease: dehydrated disk with adjacent BME that can extend over the whole length of both end plates.