Incidental diagnosis of medullary thyroid carcinoma due to persistently elevated procalcitonin in a patient with COVID-19 pneumonia: A case report

Figure 1 Graph of procalcitonin vs C-reactive protein during admission and procalcitonin drop postoperatively (she was operated at 140 d since her first admission). Procalcitonin measured in ng/mL; C-reactive protein in mg/L. Pct: Procalcitonin; CRP: C-reactive protein.

Figure 2 Axial (A) and coronal (B) sections of positron emission tomography-computed tomography showing positive uptake of fluorodeoxyglucose in the left lobe of the thyroid gland.