Casi clinici
Risonanze magnetiche
Dynamic MRI sequence of a TMJ of a 25-year old patient with an anterior disc displacement with reduction. The clicking occurred in the late stage of mouth opening. Notice how the disc is pushed past the eminence, where it bends into a U shape. Then
the disc-condyle
relationship is reduced while the bent disc returns to its normal shape.
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Dynamic MRI
sequence of a TMJ of
a 22-year-old female
patient with an
anterior disc
displacement without
reduction. During
opening the mobile
disc is pushed
ventrally by the
condyle.
Dynamic MRI sequence of an opening/closing
movement of a normal TMJ of a 38-year-old male subject. The harmonious
movements between condyle and disc are clearly visible. Notice also some bending of the disc at the end of the opening.
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TMJ of a 50-year-old male
patient with a chief complaint
of crepitation. The static
images of this patient show
clearly the irregular bony
surfaces of both the condyle
and the eminence. An area of
low signal cranially and
dorsally to the condyle is
visible. During condylar
movement this structure
moves ventrally together with
the condyle. Notice also the
area of high signal (joint fluid)
Dynamic MRI sequence of a TMJ of a 20-year-old male patient with an anterior disc displacement without reduction. During opening the ventral part of the disc hardly moves, while the dorsal part tends to bend by moving ventrally. The sequence suggests that the disc is stuck.
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of a 19-year-old female patient with an anterior disc displacement with reduction. The disc is located under the eminence. Notice how during the initial opening the disc bends caudally to a U shape.
Suddenly, the disc
springs dorsally to a
reduced position. At the
end of closing the disc
is again in its initial
Dynamic MRI sequence of a TMJ of a 24-year-old female patient with an anterior disc displacement with reduction.
Notice that the patient needs 3 movement phases to fully open the mouth. In the first phase there is some translation, followed by a rotary movement and dorsal translation. The disc is not reduced. In the second phase the disc is reduced. The sequence stops with the condyle under the eminence. Finally, the condyle translates and rotates ventrally to the eminence.
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