Multiple ultrasound examination detected spontaneous regression of thyroid sarcoidosis: a case report

A 37-year-old woman was referred with a low-density area in her right thyroid lobe by CT scan. Ultrasonography showed a diffusely hypoechoic lesion with rough internal echo in the right lobe. Fine needle aspiration cytology revealed epithelioid cells and granulomas with multinucleated giant cells. With these findings and the presence of typical findings, she was diagnosed with thyroid sarcoidosis. After two months, the hypoechoic lesion was remarkably reduced without steroid therapy, suggesting spontaneous regression. Thyroid sarcoidosis should be considered in a case with systemic sarcoidosis, hypoechoic lesion without pain, and spontaneously regressed thyroid lesion detected by multiple ultrasonography.