第４版からページ数を倍増し、２巻本として刊行（Part AとPart Bに対応）。編者・著者として世界中から285名もの専門家が参加。1,500点以上の高品質画像、5,000以上の出典を収録。 This volume, prepared by 285 authors and editors, contains more than 1500 high-quality images and more than 5000 references. Contents: Part A: Nasal, paranasal, and skull base tumours; Nasopharyngeal tumours; Hypopharyngeal, laryngeal, tracheal, and parapharyngeal tumours; Salivary gland tumours; Oral cavity and mobile tongue tumours; Oropharyngeal tumours; Odontogenic and maxillofacial bone tumours; Part B: Ear tumours; Soft tissue tumours; Haematolymphoid proliferations and neoplasia; Melanocytic tumours; Tumours and tumour-like lesions of the neck and lymph nodes; Germ cell tumours; Metastasis; Neuroendocrine neoplasms and paraganglioma; Genetic tumour syndromes involving the head and neck