Thyroid carcinoma as first manifestation of familial adenomatous polyposis

Abstract A 22-year-old female member of a family with familial adenomatous polyposis (FAP) presented with a thyroid nodule. Histology revealed a follicular carcinoma. The patient was on regular follow-up as part of the FAP screening program; 1.5 years after the thyroidectomy she appeared to have multiple adenomatous polyps in her colon and FAP was diagnosed. Thyroid carcinoma is one of the extraintestinal manifestations of FAP and particularly women in the age of 25–35 years are at risk according to the literature.