Riedel's struma associated with subacute thyroiditis, hypothyroidism, and hypoparathyroidism

Area of Science:

• Endocrinology
• Pathology

Background:

• Riedel's struma is a rare thyroid disease characterized by dense fibrous invasion.
• Subacute thyroiditis is a common inflammatory thyroid condition.
• Primary hypothyroidism is a condition of insufficient thyroid hormone production.

Observation:

• A patient presented with clinical subacute thyroiditis superimposed on primary hypothyroidism.
• The patient exhibited Riedel's struma with extensive fibrous invasion of surrounding tissues.
• Spontaneous primary hypoparathyroidism developed in the patient.

Findings:

• Riedel's struma may represent an uncommon stage of subacute thyroiditis, or a coincidental occurrence.
• Parathyroid function normalized spontaneously after partial goiter resection, correlating with goiter resolution.
• The patient experienced a transition from hypothyroidism to hyperthyroidism.

Implications:

• This case broadens the understanding of potential presentations and associations of thyroiditis and Riedel's struma.
• The spontaneous recovery of parathyroid function offers insights into the dynamic nature of thyroid disease complications.
• The development of hyperthyroidism in a hypothyroid patient underscores the complexity of thyroid dysfunction management.