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Follicular-Patterned Lesions of the Thyroid
The Bane of the Pathologist

Zubair W. Baloch MD, PhD, Virginia A. LiVolsi MD
DOI: http://dx.doi.org/10.1309/8VL9-ECXY-NVMX-2RQF 143-150 First published online: 1 January 2002


This review focuses on follicular-patterned lesions of the thyroid gland and their differential diagnosis. Included are a discussion of the features differentiating follicular adenoma from adenomatous or hyperplastic nodule and follicular adenoma from follicular carcinoma and the follicular variant of papillary thyroid carcinoma. The cytologic and histologic characteristics are described, and criteria for diagnosing the major follicular lesions are reviewed.

Key Words:
  • Follicular carcinoma
  • Follicular neoplasm
  • Follicular variant of papillary thyroid carcinoma