CD4 and thyroiditis: Postoperative day 3, a neck computed tomography (CT) revealed gas bubbles within the thyroid parenchyma, indicative of thyroid pneumatosis, likely leading to destructive thyroiditis (TSH 0.109 μUI/mL, free T4 of 27.1 pmol/L, and free T3 of 4.08 pmol/L).