Reasons for difficulties in the interpretation of thyroid scintigraphy results with 99mTc-pertechnetate in functional autonomy of thyroid nodules and Graves’ disease: a clinical case

Thyrotoxicosis is a condition caused by an excess of thyroid hormones, such as thyroxine (T4) and triiodothyronine (T3), in the body, leading to corresponding clinical manifestations. One of the main challenges in the differential diagnosis of various forms of thyrotoxicosis is the similarity in the clinical presentation of diseases. Therefore, the main tools for accurate diagnosis verification in the wide spectrum of thyrotoxicosis nosologies are the correct sequence of laboratory and instrumental investigations and subsequent interpretation of the obtained results. Only accurately established disease etiology will allow for the selection of the most appropriate and effective treatment for a particular patient, as well as the avoidance of unjustified risks of possible complications. In this article, we will discuss the main difficulties that may arise during the differential diagnosis of various forms of thyrotoxicosis, as well as address some key aspects of proper diagnosis.