A Case of Amelanotic Malignant Melanoma of the Lingual Base That Was Diagnosed Based on a Biopsy of Late Metastasis to a Lumbar Vertebra after Being Misdiagnosed as HPV-Positive Oropharyngeal Anterior Wall Squamous Cell Carcinoma

Figure 2

(a) Neck CT showed a tumor at the base of the tongue and left cervical lymph node metastasis. (b) Chest CT showed a nodule in the right inferior lobe of the lung and a postoperative scar lesion derived from breast cancer on the right chest wall. (c) PET-CT showed marked glucose uptake by the base of the tongue (maximum standardized uptake value (SUV max) early: 16.35, delayed: 17.90), the left cervical lymph nodes (SUV max early: 15∼17, delayed: 17∼19), (d) the scar on the right chest wall (SUV max early: 3.47, delayed: 3.19), and the nodule in the right lung (SUV max early: 2.09, delayed: 2.42). (e) There was no other apparent distant metastasis. (f, g) Neck MRI T1-weighted imaging (WI) and T2WI showed that the tumor at the base of the tongue and the left cervical lymph nodes exhibited slightly higher intensity than the surrounding muscles.