Fig 6. Patient 19, a 64-year-old man status post 5 months of radiation therapy (70 Gy) for treatment of a squamous cell carcinoma of the left tonsil, with an enhancing ulceration in the left oropharyngeal wall (arrows) in which biopsy was not performed (category 5). This patient has been followed for 20 months since initial diagnosis without evidence or tumor recurrence.