APRESENTAÇÕES DE CASOS August 01, 2009 August 01, 2009

Benign hepatic cyst mimicking thyroid carcinoma metastasis

DOI: 10.1590/S0004-27302009000600014

INTRODUCTION: The follow-up of differentiated thyroid carcinoma (DTC) for detecting persistent or recurrent disease is based on iodine whole body scan (WBS), the evaluation of the tumor marker thyroglobulin (Tg), the anti-thyroglobulin antibody (anti-Tg) and neck ultrasonography (US). Well known false-positive causes of WBS include inflammatory processes, some non-thyroid tumors, kidney or even sebaceous cysts . METHODS: We reported a case of false-positive WBS, after therapeutic dose of (¹³¹I) NaI. RESULTS: We enphasize the importance of recognizing benign liver cysts mimicking DTC metastasis. CONCLUSIONS: False-positive and negative results may occur with WBS and must be recognized to avoid mismanagement.