3. DISCUSSION
Concerning internal derangement in TMJ, the disk is often displaced anteriorly with or without reduction. Therefore, posterior disc displacement is very rare [1-10], and the cause or treatment method has not been clarified. Posterior disc displacement of TMJ occurs at the end of mouth closing or on wide mouth opening [2,3,9,10]. The former is associated with posterior disc displacement without reduction and the latter is associated with tem- poromandibular dislocation (posterior disc displacement without reduction on wide mouth opening) or open lock (posterior disc displacement with reduction on wide mouth opening): articular disc incoordination. MRI is ne-
3. DISCUSSION
Concerning internal derangement in TMJ, the disk is often displaced anteriorly with or without reduction. Therefore, posterior disc displacement is very rare [1-10], and the cause or treatment method has not been clarified. Posterior disc displacement of TMJ occurs at the end of mouth closing or on wide mouth opening [2,3,9,10]. The former is associated with posterior disc displacement without reduction and the latter is associated with tem- poromandibular dislocation (posterior disc displacement without reduction on wide mouth opening) or open lock (posterior disc displacement with reduction on wide mouth opening): articular disc incoordination. MRI is ne-
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