TG and Hashimoto thyroiditis: Concurrently, due to the combination of TSH PitNET and Hashimoto’s thyroiditis in this patient, dynamic testing of thyroid function (TSH, FT3, and FT4) and corresponding antibodies (TRAb, TPOAb, TG, and TGAb) helped to diagnose and identify the cause of thyroid function variations and guided follow-up treatment.