Morphological abnormalities in children with thyroidal congenital hypothyroidism

Area of Science:

• Endocrinology
• Medical Genetics
• Developmental Biology

Background:

• Congenital hypothyroidism (CH) is associated with an increased incidence of congenital anomalies.
• Specific extra-thyroidal abnormalities are observed in patients with CH and known gene mutations involved in thyroid development.

Purpose of the Study:

• To investigate the types and patterns of morphological characteristics in relation to the specific etiology of congenital hypothyroidism of thyroidal origin (CH-T).

Main Methods:

• A physical examination of the body surface for visually detectable morphological abnormalities was performed on 242 Dutch CH-T patients (thyroid agenesis, dystopic or eutopic thyroid gland).
• Results were compared to a control group of 1,007 Dutch subjects.

Main Results:

• The overall percentage of CH-T patients with major abnormalities (33.1%) was significantly higher than in controls (21.8%).
• Patients with dystopic thyroid glands showed a higher incidence of major malformations, including bilateral ear pits and oligodontia.
• A significantly higher percentage of CH-T patients exhibited minor anomalies (96.3%) compared to controls (82.5%).

Conclusions:

• The etiological grouping of CH-T patients and detailed analysis of morphological findings can aid in identifying novel genes crucial for thyroid development.
• The study underscores the association between CH-T subtypes and specific patterns of congenital malformations.