Fig. 5.

Mandibular growth zone. Sagittal oblique fast spin echo images in a 3-year-old girl show the mandibular growth zone at the surface of the condyle. a Beneath the low signal intensity line of cartilage and subchondral bone, this is seen as a narrow zone of high signal intensity (arrow) on fluid-sensitive sequence (TR/TE 5,400/77 ms, fat-saturated). b On postcontrast fat-saturated T1-weighted images (TR/TE 670/10 ms) there is corresponding enhancement. These findings represent the well vascularised zone of endochondral ossification. Note enhancement of the whole lower joint compartment as well as anterior recess of upper compartment. T1 fs Gd contrast-enhanced fat saturated T1-weighted, T2 fs fat saturated T2-weighted