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File:Histopathology of hyperfunctioning and non-hyperfunctioning thyroid follicular adenoma.jpg|'''Thyroid follicular adenoma''', being architecturally and cytologically different from surrounding gland, and being completely enveloped by thin fibrous capsule (if not being encapsulated, mainly consider thyroid carcinoma if atypical cells, otherwise nodular hyperplasia with dominant nodule, the latter especially if there are hyperplastic changes elsewhere in gland). <ref>{{cite web|url=https://www.pathologyoutlines.com/topic/thyroidfollicularadenoma.html|title=Thyroid & parathyroidBenign thyroid neoplasms. Follicular adenoma.|author=Sheren Younes, M.D.|website=Pathology Outlines}} Last author update: 1 November 2014. Last staff update: 8 March 2022</ref> Hyperfunctioning follicular adenoma typically shows follicles with papillary infoldings and bubbly, pale colloid with peripheral scalloping (a). Non-hyperfunctioning adenomas with papillary hyperplasia usually show a more predominantly papillary pattern without vacuolated cytoplasm and scalloping colloid (b).<ref name=Cameselle-Teijeiro2020>{{cite journal| author=Cameselle-Teijeiro JM, Eloy C, Sobrinho-Simões M| title=Pitfalls in Challenging Thyroid Tumors: Emphasis on Differential Diagnosis and Ancillary Biomarkers. | journal=Endocr Pathol | year= 2020 | volume= 31 | issue= 3 | pages= 197-217 | pmid=32632840 | doi=10.1007/s12022-020-09638-x | pmc=7395918 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=32632840 }}<br>"This article is licensed under a Creative Commons Attribution 4.0 International License"</ref>