Glottic-supraglottic barrier: fact or fantasy?

Area of Science:

• Otolaryngology
• Head and Neck Surgery
• Surgical Oncology

Background:

• The existence of an anatomical barrier between the glottic and supraglottic larynx remains unconfirmed by serial section studies.
• Squamous cell carcinomas of the supraglottic larynx typically remain localized superior to the ventricle.
• This localization contributes to high local control rates with horizontal supraglottic laryngectomy.

Purpose of the Study:

• To investigate the anatomical spread patterns of supraglottic squamous cell carcinoma.
• To determine if tumors cross or encircle the laryngeal ventricle.
• To evaluate the implications for surgical management, specifically horizontal supraglottic laryngectomy.

Main Methods:

• Analysis of whole organ serial sections from laryngectomy specimens.
• Histopathological examination to identify tumor location relative to the laryngeal ventricle and surrounding structures.
• Correlation of tumor spread patterns with surgical outcomes.

Main Results:

• Whole organ sections suggest tumors spread by encircling the ventricle rather than crossing it.
• Tumor extension posterior to the ventricle or onto the arytenoid cartilage was observed.
• Such extension indicates contraindication for standard horizontal supraglottic laryngectomy.

Conclusions:

• The laryngeal ventricle may not function as an absolute barrier to tumor spread.
• Tumor encirclement of the ventricle is a critical finding for surgical planning.
• Identification of tumor extension beyond the ventricle necessitates alternative surgical approaches.