# A case of immunotherapy-induced thyroiditis

## TL;DR

A cancer patient on immunotherapy developed thyroiditis, highlighting the need for careful monitoring and diagnosis of thyroid issues during treatment.

## Contribution

This case report emphasizes the diagnostic challenges of immunotherapy-induced thyroiditis and the importance of serial imaging.

## Key findings

- A 65-year-old male with melanoma developed thyroid dysfunction and acute neck pain after immunotherapy.
- Ultrasound revealed thyroid atrophy, confirming immunotherapy-induced thyroiditis.
- Adjusting thyroxine and steroids improved thyroid function and symptoms.

## Abstract

Immunotherapy treatments for cancer are known to cause adverse thyroid events which present a diagnostic challenge to clinicians and radiologists. This case report highlights the importance of a high clinical index of suspicion and careful assessment of the thyroid on serial imaging studies to make the diagnosis. The case involves a 65-year-old male with malignant melanoma who was started on immunotherapy as part of a clinical trial. He developed thyroid dysfunction followed by an attack of acute neck pain. Ultrasound of his thyroid was performed which showed significant atrophy. A review of previous imaging was undertaken which confirmed the patient had suffered from thyroiditis and subsequent atrophy. Following this, the diagnosis of immunotherapy-induced thyroid dysfunction was made. Thyroxine supplementation and steroid dose were then adjusted causing his thyroid function and symptoms to improve. Immunotherapy agents for cancers are becoming more and more common. As the case report shows, physicians and radiologists will need to be vigilant to diagnose and treat any adverse events.