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Fig. 4. —Temporomandibular joint (TMJ) in 39-year-old man. Diagnosis of disk displacement and degeneration was based on findings on MR imaging. Interpretation of sonographic findings resulted in false-negative diagnosis. Longitudinal high-resolution sonogram shows anterosuperior TMJ compartment with disk disrupted in posterior (large arrows) and anterior (small arrows) parts. Anterior part of disk (small arrows) is displaced anteriorly to condyle (arrowheads). E = articular eminence, D = disk, C = condyle.