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Figure 29. Short tau inversion recovery (STIR) sequence at a corresponding level to Figure 28, shows a high signal lesion (white), 1 cm in diameter, in the same area (arrowed). The patient had been to the dentist the previous day and recollected an abnormally unpleasant sensation in the area when a second inferior dental nerve block injection was given. The position of the lesion was near the site where the neurovascular bundle of the mandibular branch of the trigeminal nerve splits into the lingual nerve and the inferior dental nerve and associated vessels. The injection had perforated one of these vessels, resulting in a small haematoma visible on MRI.
