Fig. 5.

Magnetic resonance imaging (T1-weigted) showing sagittal sections through the temporomandibular joint (TMJ) in a patient with idiopathic condylar resorption (ICR): (A) Right TMJ in open mouth position, and (B) closed mouth position showing an anteriorly displaced disc, which doesn’t reduce back to position (red arrow). The antero-superior surface of the condyle presenting a missing low-signal rim (yellow arrow), which is indicative of active erosion of the surface of the condyle. (C) Left TMJ of the same patient in closed mouth position and (D) open mouth position showing a disc displaced anteriorly without reduction (red arrow), along with a reduction in its anteroposterior dimension while maintaining biconcave shape. The condylar surface is flattened with reduced height and shows a low-signal rim indicative of stable stage of ICR.