A Rare Presentation of Metastasis to the Thyroid Gland

Abstract

A 64-year-old gentleman, known case of adenocarcinoma of prostate, Gleasons's combined score 7(4+3), who underwent robotic prostatectomy two years ago, presented to the Surgical Oncology Department for follow up. He had no specific complaints. Clinical examinations as well as routine investigations were within normal limits. His serum Prostate Specific Antigen (PSA) was 3.1ng/ ml. Postoperatively his serum PSA dropped to undetectable levels and had remained so till this checkup. As the clinician suspected a local recurrence of the tumour, a Positron Emission tomography (PET) scan was performed which showed a small hypodense lesion of size 7-8 mm in inferior pole of left lobe of thyroid gland. Ultrasound guided FNAC from that site revealed cellular smears with singly dispersed and loose clusters of moderate to highly pleomorphic cells suggestive of anaplastic carcinoma [Table/Fig-1]. Thyroid function tests were within normal limits. Total thyroidectomy was done.