Abstract
Two cases of glottic cancer with congenital muscular torticollis were reported. There were some deformities of the larynx in these cases. Lamina of the thyroid cartilage in the tortile neck side was notably subjected to pressure and was wry towards the inner cavity of the larynx. Nevertheless, the cricoid cartilage was well kept up the shape to normal. It was confirmed that the cricoid cartilage used the thyroid cartilage as a shield against pressure in the torticollis. Because cancerous growth was found in the vocal cord of the tortile neck side, it was suggested that the chronic mechanical stimulation to the vocal cord led to cancerization.
