Review Question - QID 214342

A 37-year-old woman presents to her primary care physician with a 3-day history of diarrhea and palpitations. She says that her heart started beating quickly about 1 week ago but thought that it was due to stress at her job. She became concerned a few days ago when she started noticing occasional palpitations and watery diarrhea. Otherwise, she endorses feeling hot over the last week as well as a cough and sore throat 2 weeks ago that resolved with over-the-counter medications. Physical exam reveals hyperactive deep tendon reflexes as well as midline neck tenderness. Which of the following would most likely be seen on histology?