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(a) Type I attachment of the lateral pterygoid muscle (LPM); (b) anterior disc displacement on MRI of the temporomandibular joint (TMJ) with the Type I attachment of LPM on the selected slice in the oblique sagittal plane in intercuspal position (IP); and (c) no disc on MRI of TMJ with the Type I attachment of the LPM on the selected slice in the oblique coronal plane in IP [same joint as in (b)].
