Sonogram of the lesion on the lower lip. A gray-scale and transverse sonogram of the lesion obtained with the patient’s mouth closed. The shape of the lesion was almost oval. A heterogeneous tumor-like lesion of 17 × 11 × 12 mm in size was observed in her left lower lip. The ulcerative lesion was hypoechoic (white arrow). The mandibular teeth are indicated with white arrowheads