Autoimmune thyroiditis - track towards autoimmune polyendocrinopathy type III.

Area of Science:

• Endocrinology
• Immunology
• Genetics

Background:

• Autoimmune polyendocrinopathies (AP) involve multiple endocrine gland failures due to autoimmune processes.
• AP is classified into types I, II, III, and IV, each with distinct clinical and genetic features.
• Type III AP specifically involves autoimmune thyroid disease and type 1 diabetes mellitus.

Observation:

• A 53-year-old female with a history of Hashimoto's thyroiditis presented with symptoms of polyuria, polydipsia, asthenia, weight loss, abdominal pain, and vomiting.
• Clinical examination revealed dehydration and tachycardia.
• Laboratory findings included hyperglycemia, glucosuria, acetonuria, and highly elevated anti-GAD antibodies, with normal TSH, cortisol, and anti-21 hydroxylase antibodies.

Findings:

• The patient was diagnosed with type 1 diabetes mellitus (T1DM) in conjunction with her existing Hashimoto's thyroiditis.
• This presentation is consistent with autoimmune polyendocrinopathy type III, a rare syndrome predominantly affecting females.
• The initial manifestation was dominated by autoimmune thyroiditis, a common endocrine autoimmunity in adults.

Implications:

• This case underscores the importance of recognizing autoimmune polyendocrinopathy type III, particularly when autoimmune thyroid disease presents alongside other endocrine autoimmune conditions.
• Early diagnosis and appropriate hormonal substitution are crucial for managing patients with this rare syndrome.
• Further research into the genetic and immunological underpinnings of AP type III may improve diagnostic and therapeutic strategies.