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FIG 2. Patient 2, a 29-year-old man status post prior resection of a desmoplastic melanoma of the lower lip presents with decreased sensation over his left lower jaw.
A, Contrast-enhanced axial T1-weighted image (600/11/2) with fat saturation demonstrates a mass (arrows) just medial to the mandibular foramen, as well as subtle decrease in bulk of the left-sided muscles of mastication.
B, Contrast-enhanced coronal T1-weighted image (600/11/2) with fat saturation demonstrates enlargement and abnormal enhancement of the left CN V3 (arrowheads) from the level of the mandibular foramen up to the left Meckel’s cave, consistent with perineural spread of tumor.
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