Hyalinizing Trabecular Adenoma of Thyroid : A Rare Case Report

Introduction: Hyalinizing trabecular tumor (HTT) is an unusual thyroid neoplasm that was first described by Carney in 1987.Many cytological and histological features of such tumors may be mistaken for Papillary Thyroid Carcinoma (PTC) and Medullary Thyroid Carcinoma (MTC).This can lead to overtreatment like total thyroidectomy and lymph node dissection. Here, we present a rare case of hyalinizing trabecular tumor of thyroid in a young female emphasizing the pathological features of HTT, which may help to reduce over diagnosis thereby guiding proper management. Case report: A 40 year old female patient presented with a lump in the left side of the neck. Lump increased gradually over a period of 5 months and was associated with mild pain and restricted neck movement. Thyroid profile of the patient was within normal limits. USG revealed a solid cold nodule, which was regarded as a thyroid adenoma. Nodule was surgically removed and after pathological examination diagnosed as hyalinizing trabecular adenoma (HTA) of thyroid. Conclusion: Hyalinizing trabecular adenoma is rare and can be confused with malignant lesions of thyroid. Some peculiar histomorphological features mentioned in this case report will help in diagnosis and further management.