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FIG 4. T1-weighted MR images.
A, Axial image (520/14/4) obtained 14 months after the onset of symptoms shows loss of the normal fat signal hyperintensity in the left pterygopalatine fossa (arrowhead). This finding represents infiltration of the latter by a lesion that is isointense relative to muscle.
B, Coronal enhanced image (520/14/3) obtained through the base of the skull. The left foramen rotundum is enlarged and infiltrated by a discrete, hyperintense, soft-tissue mass (arrowhead).
C, Sagittal enhanced image (520/14/3) obtained through the left pterygopalatine fossa shows the palate lesion (white arrowheads), which extends through a widened foramen rotundum into the pterygopalatine fossa (black arrowheads).
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