A 34-year-old primigravida at 14 weeks of gestation presents with fatigue, weight gain, cold intolerance, and constipation. Thyroid function tests show TSH 8.6 mIU/L with low-normal free T4. Thyroid peroxidase antibodies are markedly elevated at 980 IU/mL. High-resolution ultrasound of the thyroid is performed. The structure marked **A** in the diagram shows a diffusely hypoechoic and heterogeneous parenchyma compared to the strap muscles. Based on this sonographic finding and the clinical presentation, what is the most likely diagnosis?
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