Signet-ring cell microfollicular adenoma arising in a nodular ectopic thyroid. A case report

A symptomless submandibular mass removed from a 61-year-old white male proved to be a signet-ring microfollicular adenoma arising in ectopic thyroid tissue. The lesion was established as a primary, non-mucin producing thyroid adenoma and a diagnosis of secondary signet-ring adenocarcinoma excluded.