Laryngeal crepitus is seen in:
1.Normal persons
2.Fractures of thyroid cartilage
3.Post cricoid carcinoma
4.Prevertebral abscess
sol:
Laryngeal crepitus is a grating sound produced when larynx is moved from side to side. It is produced due to larynx moving against the vertebral column. It is seen in normal persons. However, if something intervenes between thyroid cartilage and vertebral column, it becomes absent as in post-cricoid carcinoma or prevertebral abscess.