Abstract
Medullary thyroid carcinoma is a relatively rare phenomenon. We report a case of medullary thyroid carcinoma detected by FDG-PET examination during a medical checkup for an elevated serum CEA value. A 67-year-old female was identified with an elevated serum CEA value by a general practitioner. GI tract and lung CT examinations showed no abnormal findings. However, FDG-PET examination identified an intensive signal mass in the left thyroid lobe. For further examinations, she was referred to our hospital.
Aspiration biopsy cytology showed a malignant tumor of the thyroid gland. In addition, medullary thyroid carcinoma was highly suspected from high serum CEA and calcitonin values. Therefore, a left lobectomy, isthmectomy and left modified neck dissection were performed.
Pathological and immunohistochemical findings led to a diagnosis of medullary thyroid carcinoma.
