[Early-onset hyperthyroidism with muscle involvement: a report on a patient]

Area of Science:

• Pediatric Endocrinology
• Autoimmune Diseases
• Neuromuscular Disorders

Background:

• Graves' disease is a common cause of hyperthyroidism in adults, but its occurrence in very young children is rare.
• Early diagnosis and management are crucial to prevent long-term complications in pediatric patients.

Observation:

• A 2-year-old child presented with significant tachycardia, unexplained weight loss, anxiety, and abnormal gait.
• Clinical signs suggested a hypermetabolic state and potential neuromuscular involvement.

Findings:

• Laboratory results revealed elevated serum free triiodothyronine (fT3) and free thyroxine (fT4) levels.
• Thyrotropin receptor antibodies (TRAb) were significantly increased, while thyroid-stimulating hormone (TSH) was undetectable.
• Electromyography (EMG) demonstrated abnormal findings, characterized by short-duration motor unit potentials, indicative of myopathy.

Implications:

• This case highlights the importance of considering Graves' disease in the differential diagnosis of hyperthyroidism and neuromuscular symptoms in young children.
• The findings underscore the need for comprehensive evaluation, including endocrine and electrodiagnostic testing, for accurate diagnosis and timely intervention in pediatric cases.
• Further research into the specific mechanisms and long-term outcomes of early-onset Graves' disease is warranted.