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American Journal of Roentgenology, Vol 150, Issue 2, 381-389
Copyright © 1988 by American Roentgen Ray Society

Articles

Temporomandibular joint: MR imaging of internal derangements and postoperative changes

KP Schellhas, CH Wilkes, HM Fritts, MR Omlie, KB Heithoff, and JA Jahn

Center for Diagnostic Imaging, St. Louis Park, MN 55416.

Nineteen abnormal temporomandibular joints (TMJs) imaged with high-field-strength surface-coil MR are presented to illustrate specific changes associated with disk derangement, trauma, and previous surgery. Cases were selected from a series of 248 TMJ MR studies in 144 patients (9-68 year old, 130 females and 14 males) performed during a 5-month period. Surgical findings were available for correlation in 44 of the 248 joints studied. Increased signal caused by myxoid degeneration within the degenerating meniscus was seen, as were pathologic changes including atrophy, fibrosis, and contracture of masticatory muscles occurring with internal derangements. Advantages and limitations of MR are discussed with reference to arthrography and videofluoroscopy. High-resolution and partial-flip-angle images of a normal joint are provided for comparison. In most clinical circumstances, MR is the procedure of choice when examining the TMJ, because it provides contrast resolution of soft-tissue structures superior to that of conventional imaging techniques.
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Copyright © 1988 by the American Roentgen Ray Society.