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• W4387362488 abstract "Abstract Disclosure: P. Kachhadia: None. S. Khan: None. S. Aldasouqi: None. A. Abu Limon: None. Introduction: Thyroid hemiagenesis is congenitally rare, in which one side of the thyroid does not develop. Hemiagenesis is more common with an absent left thyroid lobe, at a 4:1 ratio. Though prevalence is sited at 0.05%, actual incidence of hemiagenesis amongst the population is unknown as most patients are euthyroid and asymptomatic. We present a case of a patient who was referred to our clinic for unilateral thyroid enlargement on physical exam. Thyroid Ultrasound (US) was done which showed an absent left thyroid lobe along with enlarged right thyroid lobe and hypervascularity. There was also an incidental thyroid nodule noted on US. Case Presentation: Patient is a 38 year old female who presented to the clinic 4 years prior for enlarged thyroid nodule noted on ultrasound. With symptoms of dysphagia and a visibly enlarged gland, an US with labs was prompted by her primary physician. US showed absent left thyroid lobe and right lobe enlargement with hypervascularity and incidental subcentimeter nodule. Clinically and biochemically, the patient was euthyroid. Singular right lobe was verified on clinic real time ultrasound and on NM uptake scan. The 24 hour uptake was at 30.5%, with the upper limit of normal being 30%. With increased uptake and hypervascularity, thyroid stimulating immunoglobulin and thyrotropin receptor antibodies were checked and were not detected. It was thought that the right thyroid gland enlargement and hypervascularity were compensatory due to the left hemiagenesis. The thyroid nodule was monitored, and within 3 years of original imaging, it enlarged to 0.98 x 0.59 x 0.39 cm, with TI-RADS 5 assessment per ACR criteria. Patient chose to undergo thyroid biopsy which showed Bethesda III, Follicular Lesion of Undetermined Significance (FLUS). Microscopy showed follicular cells arranged in microfollicles and crowded groups with round, enlarged, irregular nuclei and overlapping nucleoli. Intranuclear chromatin clearing and intranuclear grooves are present. Background is hemorrhagic with minimal colloid. Molecular Thyroseq testing was at 5-10% chance of malignancy or noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP). Genetic markers were only positive for copy number alterations. Discussion: Thyroid Hemiagenesis, though rare, has been associated with other thyroid pathologies such as hypothyroidism, hyperthyroidism and thyroid malignancies. Genetic studies have not found a common background within cases reported. As these patients are more likely to incur additional thyroid pathologies, questions still remain as to the clinical management and outcome of such patients. Due to concerning cytological features for PTC, the patient was offered right thyroidectomy and will be looking to make a decision in the near future. Presentation Date: Saturday, June 17, 2023" @default.
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• W4387362488 date "2023-10-01" @default.
• W4387362488 modified "2023-10-06" @default.
• W4387362488 title "SAT476 A Case of Thyroid Hemiagenesis" @default.
• W4387362488 doi "https://doi.org/10.1210/jendso/bvad114.1950" @default.
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