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FIG 2. A transverse section of sonography of the normal right TMJ obtained while the patient was in the closed-mouth position. Note hyperechoic line (arrowhead) running lateral and parallel to the lateral surface (arrow) of the mandibular condyle, indicating the articular capsule. We measured the distance between the articular capsule and the lateral surface of the mandibular condyle (between the apexes of the arrow and arrowhead) on the display of the sonographic equipment
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