[Familial goitrous cretinism with giant goiter and hyperthyroglobulinemia: report of two siblings]

Area of Science:

• Endocrinology
• Genetics
• Metabolic Disorders

Background:

• Familial occurrence of goiter and hypothyroidism suggests a genetic basis.
• Untreated cretinism can lead to severe developmental impairments.
• Iodide organification is a critical step in thyroid hormone synthesis.

Observation:

• Two siblings presented with giant goiters and diagnosed cretinism.
• Goiters were present from early childhood in the male and adulthood in the female.
• Perchlorate discharge tests indicated impaired iodide organification in both individuals.

Findings:

• Both patients exhibited extremely high serum thyroglobulin concentrations (1800 ng/ml).
• The clinical presentation and diagnostic tests confirmed impaired iodide organification as the cause of goiter and hypothyroidism.
• This case represents a rare instance of goiterous cretinism associated with hyperthyroglobulinemia due to this specific defect.

Implications:

• Highlights the importance of early diagnosis and treatment of congenital hypothyroidism to prevent cretinism.
• Suggests a potential genetic defect affecting iodide organification, leading to familial goiter and hypothyroidism.
• Further research into the genetic underpinnings of impaired iodide organification and its association with hyperthyroglobulinemia is warranted.