*Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand

†Department of Head and Neck/Oral Pathology, Guy’s and St Thomas’ NHS Trust, London, UK

The authors have no funding or conflicts of interest to disclose.

All figures can be viewed online in color at www.anatomicpathology.com.

Reprints: Ann Sandison, MBChB, Floor 4 Guy’s Tower, Guy’s Hospital, London SE1 9RT, UK (e-mail: [email protected]).