Abstract
Background: A 26-year-old female with multiple endocrine neoplasia type 2A presented with an elevated serum calcitonin (710 ng/L, normal range 0-12 ng/L) and carcinoembryonic antigen (CEA, 110 μg/L, normal range 0.0-3.0 μg/L) during routine checkup. Eleven years before, at the age of 15, she was surgically radically treated for a medullary thyroid carcinoma. Otherwise the medical history was unremarkable. There were no palpable abnormalities in the breasts