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Prevalence of Thyroid Cancer in Familial Adenomatous Polyposis Syndrome and the Role of Screening Ultrasound Examinations
source: Clinical gastroenterology and hepatology
year: 2007
authors: Herraiz M, Barbesino G, Faquin W, Chan-Smutko G, Patel D, Shannon K M, Daniels G H, Chung D C
summary/abstract:BACKGROUND & AIMS : Thyroid carcinoma is an extraintestinal manifestation of familial adenomatous polyposis (FAP) syndrome, but the precise risk is unknown. The optimal approach for thyroid cancer screening has not been established. We sought to define the prevalence of thyroid cancer and the role of screening ultrasound in FAP patients.
METHODS : We performed a retrospective chart review of 51 patients with a proven diagnosis of FAP at a single tertiary institution. Clinical records, genetic test results, ultrasound examinations, and histopathology were reviewed.
RESULTS : Papillary thyroid cancer was diagnosed in 6 female patients (12%). The mean age of thyroid cancer diagnosis was 33 years, and mean tumor size was 12 mm. However, all patients had additional malignant foci that were small (1-9 mm), and none had suspicious features of malignancy on ultrasound. Of 28 patients who had at least one screening ultrasound, 22 (79%) had thyroid nodules, and 2 (7%) had papillary thyroid carcinoma. Of those with nodules, 68% had multinodular disease. A follow-up ultrasound in 12 patients after a mean of 15 months revealed no changes in either the number or size of nodules.
CONCLUSIONS : The 12% prevalence of thyroid cancer in this series of FAP patients is significantly higher than in previous reports. Among patients undergoing screening ultrasound, 7% had thyroid cancer. Nodular thyroid disease is very common in FAP. Because small nodules (
organization: Massachusetts General Hospitalread more full text source
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