FINE-NEEDLE ASPIRATION OF ANAPLASTIC THYROID-CARCINOMA WITH VARIED CYTOLOGIC AND HISTOLOGIC PATTERNS - A CASE-REPORT

Anaplastic carcinoma of the thyroid (ACT) is a rare subtype of thyroid neoplasm. This tumor represents approximately 5-10% of all thyroid ma lignancies and its poor prognosis has not changed in 25 years. A CT of ten arises in a long-standing thyroid nodule and has been documented t o be associated with a variety of more well-differentiated thyroid car cinomas. We describe the cytologic features of a case in which the pat ient had a 10-yr history of a thyroid nodule. The ACT in this case had a cytologic and histologic appearance of several different subtypes o f thyroid carcinomas. (C) 1994 Wiley-Liss, Inc.