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Case 97028

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Referral category

Temporomandibular joints (TMJ)

Region of interest

TMJs

Referral reason

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Canaray 97028

1. Possible anteriorly displaced articular disc in right TMJ

In the mandibular closed position, the right condylar head is slightly posteriorly positioned in the glenoid fossa. This may be suggestive of an anteriorly displaced articular disc. The osseous structures of the joint should not be assessed in this scan due to the presence of motion artifacts. The osseous structures can be examined in the scan in the mandibular open position, which does not contain motion artifacts.

Sagittal views of right TMJ in mandibular closed position

These sagittal cross-sectional images demonstrate the posterior position of the right condylar head in the glenoid fossa, which is suggestive of the presence of an anteriorly displaced articular disc.

Coronal views of the right condylar head in the mandibular closed position

The presence of motion artifacts in this scan precludes a diagnostic evaluation of the osseous structures of the joint.

Normal right TMJ in mandibular open position

In the mandibular open position, the right condylar head translates to the crest of the articular eminence. This is normal, and suggests that if the articular disc is anteriorly displaced in the mandibular closed position, it reduces upon opening. The osseous structures of the right condylar head appear normal radiographically. No signs of osseous degeneration are present in the right temporomandibular joint.

Sagittal views of the right TMJ in mandibular open position

These sagittal cross-sectional images demonstrate the position of the right condylar head at the crest of the articular eminence in the mandibular open position. Note the normal appearances of the osseous structures of the right temporomandibular joint. No signs of osseous degeneration are present.

Coronal views of TMJ in mandibular open position

These coronal cross-sectional images demonstrate the intact superior cortical surface of the right condylar head, as well as the absence of any signs of sclerosis or degeneration on the articulating surfaces of the joint.

Normal left TMJ in mandibular closed position

In the mandibular closed position, the left condylar head is centrally positioned in the glenoid fossa. The osseous structures of the joint cannot be assessed in this scan due to the presence of motion artifacts.

Sagittal views of left TMJ in mandibular closed position

These sagittal cross-sectional images demonstrate the central position of the left condylar head in the glenoid fossa in the mandibular closed position. The osseous structures of the joint are not assessed in this image series due to the presence of motion artifacts.

Coronal views of left TMJ in mandibular closed position

These coronal cross-sectional images demonstrate the motion effects that are present in this scan in the mandibular closed position.

Normal left TMJ in mandibular open position

In the mandibular open position, the left condylar head is positioned at the crest of the articular eminence. This is normal. The osseous structures of the left temporomandibular joint generally appear normal.

Sagittal views of left TMJ in mandibular open position

These sagittal cross-sectional images demonstrate the normal position of the left condylar head at the crest of the articular eminence.

Coronal views of the left TMJ

These coronal cross-sectional images demonstrate the normal overall appearance of the superior surface of the left condylar head. No significant signs of degeneration are radiographically evident in the osseous structures of the joint.