Multinodular goitre: 'much more to it than simply iodine deficiency'

Area of Science:

• Endocrinology
• Thyroidology
• Pathology

Background:

• Multinodular goitre (MNG) has historically been attributed to iodine deficiency.
• This traditional view is challenged by MNG's prevalence in iodine-sufficient regions and its complex characteristics.
• Features like multinodularity, functional heterogeneity, and autonomous growth do not align with simple iodine deficiency.

Purpose of the Study:

• To re-evaluate the pathogenesis of multinodular goitre.
• To investigate the underlying mechanisms driving MNG development and heterogeneity.
• To explore the implications of new pathogenetic concepts on MNG clinical management.

Main Methods:

• Review of existing literature and recent investigations on MNG.
• Analysis of MNG characteristics inconsistent with the iodine deficiency model.
• Conceptual framework development based on intrinsic cellular growth potential.

Main Results:

• MNGs are proposed to be benign neoplasias arising from genetically predetermined thyrocytes with high intrinsic growth potential.
• Functional and structural heterogeneity in MNG is attributed to metabolic and functional differences among individual thyrocytes.
• Iodine deficiency influences MNG epidemiology but not its fundamental pathogenetic mechanisms.

Conclusions:

• The concept of MNG as a simple consequence of iodine deficiency is outdated.
• MNG pathogenesis involves the inherent growth potential and heterogeneity of thyroid follicular cells.
• New pathogenetic insights necessitate a re-evaluation of clinical management strategies for MNG.