Laryngeal involvement by thyroid disease.

Area of Science:

• Otolaryngology
• Endocrinology
• Pathology

Background:

• Thyroid tissue in the larynx or trachea can arise from ectopic thyroid tissue or direct invasion by thyroid carcinoma.
• Benign lesions are more common in endemic goiter regions.
• Thyroid carcinoma invasion affects the larynx and trachea in about 7% of cases.

Purpose of the Study:

• To investigate the origins and prevalence of thyroid tissue and neoplastic derivatives in the larynx and trachea.
• To differentiate between ectopic thyroid tissue and direct neoplastic invasion.
• To determine the frequency of these occurrences in relation to overall tracheal tumors and laryngeal invasions.

Main Methods:

• Review of pathological findings in laryngeal and tracheal specimens.
• Analysis of patient demographics and geographical origin, particularly in relation to endemic goiter prevalence.
• Histopathological classification of thyroid tissue and neoplastic lesions.

Main Results:

• Ectopic thyroid tissue and direct thyroid carcinoma invasion are the primary sources of thyroid tissue in the larynx and trachea.
• Benign thyroid lesions constitute up to 7% of all benign tracheal tumors.
• Thyroid carcinoma invades the larynx and trachea in approximately 7% of cases, with all histologic types represented.

Conclusions:

• Thyroid tissue in the airway is a significant finding, originating from either ectopia or malignant invasion.
• The prevalence of these conditions highlights the importance of considering thyroid pathology in airway assessments.
• Further research may elucidate specific risk factors and management strategies for these rare occurrences.