Colon cancer metastasis to the thyroid gland

Thyroid metastasis originating from colon cancer is an uncommon clinical entity. We present a case of a 40-year-old Saudi male patient that was known to have metastatic adenocarcinoma of the colon, and who presented initially with hoarseness of voice. A left thyroid lesion was found and fine-needle aspiration biopsy showed that it was a colon cancer metastasis. His condition later deteriorated with development of stridor. Tracheostomy was performed and the diagnosis was confirmed by biopsy. A high index of suspicion is required to consider colorectal carcinoma metastatic to the thyroid.