Journal of the Japanese Association of Rural Medicine  2016;65(4):868-871

doi:10.2185/jjrm.65.868

A Case of Spindle Cell Type Medullary Carcinoma of the Thyroid Diagnosed by Immunocytochemistry

Satoshi IKEDA ; Atsushi Uchida ; Kazunari INOUE ; Keiko SUZUKI

Country

Japan

Language

Japanese

Abstract

　　We report a case of spindle cell type medullary carcinoma of the thyroid in a 77-year-old man. Fine needle aspiration cytology showed numerous spindle cells without inflammation and hemorrhage. The spindle cells were uniform and exhibited no malignant features. Immunocytochemistry was positive for carcinoembryonic antigen and calcitonin, and the tumor was diagnosed as spindle cell type medullary carcinoma. There are various histological subtypes of medullary carcinoma, and diagnosis by cytomorphology alone is difficult. Preservation with LBC fixative was helpful for diagnosis by immunocytochemistry in this case.