Extent of hypoechogenic area in the thyroid is related with thyroid dysfunction after subacute thyroiditis

Area of Science:

• Endocrinology
• Thyroidology
• Internal Medicine

Background:

• Subacute thyroiditis (SAT) is an inflammatory condition of the thyroid gland.
• Hypothyroidism is a potential complication following SAT, necessitating identification of risk factors and effective management strategies.

Purpose of the Study:

• To investigate the risk factors for developing hypothyroidism after subacute thyroiditis (SAT).
• To correlate initial laboratory and ultrasonographic findings with sequential thyroid dysfunction based on treatment modalities.

Main Methods:

• Retrospective review of medical records of 252 patients diagnosed with SAT.
• Analysis of laboratory data and thyroid ultrasonography findings.
• Follow-up of patients for at least 6 months to assess thyroid function and dysfunction.

Main Results:

• Over half of SAT patients (53.6%) developed transient or permanent hypothyroidism.
• Thyroid-stimulating hormone (TSH) levels were most frequently elevated around 2 months post-SAT onset.
• Prednisone (PSL) treatment was associated with a higher likelihood of normal thyroid function compared to no treatment or anti-inflammatory drugs.
• Bilateral hypoechogenic areas (HEA) on ultrasound were significantly more common in patients who developed hypothyroidism.
• Permanent hypothyroidism occurred in 5.9% of patients, all of whom initially presented with bilateral HEA and subsequently had small thyroid size.

Conclusions:

• Prednisone (PSL) treatment is linked to significantly lower rates of thyroid dysfunction after SAT.
• The extent of hypoechogenic areas (HEA) on thyroid ultrasound, rather than initial laboratory findings, may serve as a predictive marker for thyroid dysfunction post-SAT.