Thyroid hemiagenesisA 17-year-old female patient presented with complaints of fatigue and hair loss.A blood test revealed Thyroid Stimulating Hormone (TSH): 5.23 mU/ml and T4: 1.21 mU/ml.Subclinical hypothyroidism was considered and thyroid ultrasonography was performed.The left lobe of the thyroid and the left half of the isthmus were not observed.Right lobe parenchyma was normal.Doppler examination showed a normal pattern (Figure 1).There was no history of any surgery.Therefore, the diagnosis was made as thyroid hemiagenesis.Thyroid hemiagenesis is the congenital absence of one lobe of the thyroid gland.It is extremely rare.The prevalence rates vary between 0.05% and 0.5% and it is a congenital variation that is more common in females. 1 Left lobe deficiency is frequently seen.Patients who are mostly asymptomatic are usually detected at a late age on incidental thyroid ultrasonography examination.In these patients, the contralateral thyroid gland may be normal, or compensatory hypertrophy or hyperplasia may be seen.There is an increased risk of pathology in the normal lobe. 2 In the sonographic examination of these patients, it is necessary to evaluate for the possible presence of ectopic thyroid tissue in the neck. 3
Aims: This study aims to use deep learning (DL) to classify thyroid nodules as benign and malignant with ultrasonography (US). In addition, this study investigates the impact of DL on the diagnostic success of radiologists with different experiences. Material and methods: This study included 576 US images of thyroid nodules. The dataset was divided into 80% training and 20% test sets. Four radiologists with different levels of experience classified the images in the test set as benign-malignant. A DL model was then trained with the train set and predicted benign-malignant for the test set. Then, the output of the DL model for each nodule in the test set was presented to 4 radiologists, who were asked to make a benign-malignant classification again considering these DL results.Results: The accuracy of the DL model was 0.9391. The accuracy for junior resident (JR) 1, JR 2, senior resident (SR), and senior radiologist (Srad) before DL-assisting were 0.7043, 0.7826, 0.8435, and 0.8522 respectively. The accuracy in DL-assisted classifications was 0.9130, 0.8696, 0.9304, and 0.9043 for JR 1, JR2, SR, and Srad, respectively. DL assistance changed the decisions of less experienced radiologists more than more experienced radiologists. Conclusion: The DL model has superior accuracy in classifying thyroid nodules as benign-malignant with US images than radiologists with different levels of experience. Additionally, all radiologists, and most notably less experienced radiology residents, increased their accuracy in DL-assisted predictions.
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