1 MCQs in Medicine for NEET PG
A 32-year-old woman presents with a 3-month history of heat intolerance, palpitations, and progressive eye protrusion. On examination, she has a diffuse non-tender goiter with an audible bruit, and the structure marked **B** in the diagram is noted to be bilateral and symmetric. Laboratory studies show suppressed TSH (0.01 mIU/L), elevated free T4 (28 pg/mL), and positive thyroid-stimulating immunoglobulins (TSI). Which of the following pathophysiologic mechanisms best explains the finding marked **B**?
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