1. 1) El-Naggar AK, Chan JKC, Grandis JR, et al. : Tumours of the hypopharynx, larynx, trachea and parapharyngeal space. WHO Classification of Head and Neck Tumours, 4th ed. pp 77–88, World Health Organization, Lyon, 2017.
2. 2) Hosokawa S, Okamura J, Sakai N, et al. : Primary spindle cell carcinoma of the frontal sinus. J Oral Maxillofac Surg 70: e674–e678, 2012.
3. 3) Thompson LDR : Squamous cell carcinoma variants of the head and neck. Curr Diagn Pathol 9: 384–396, 2003.
4. 4) Thompson LD, Wieneke JA, Miettinen M, et al. : Spindle cell (sarcomatoid) carcinomas of the larynx: a clinicopathologic study of 187 cases. Am J Surg Pathol 26: 153–170, 2002.
5. 7) Olsen KD, Lewis JE and Suman VJ : Spindle cell carcinoma of the larynx and hypopharynx. Otolaryngol Head Neck Surg 116: 47–52, 1997.