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A thyroid adenoma is a benign tumor of the thyroid gland. ==Types== Almost all thyroid adenomas are follicular adenomas. Follicular adenomas can be described as "cold", "warm" or "hot" depending on their level of function. Histopathologically, follicular adenomas can be classified according to their cellular architecture and relative amounts of cellularity and colloid into the following types: *Fetal (microfollicular) - these have the potential for microinvasion.〔 These consist of small, closely packed follicles lined with epithelium.〔(TheFreeDictionary > microfollicular adenoma ) Citing: Dorland's Medical Dictionary for Health Consumers. Copyright 2007〕 *colloid (macrofollicular) - these do ''not'' have any potential for microinvasion〔 *embryonal (atypical) - have the potential for microinvasion.〔 *Hürthle cell adenoma (oxyphil or oncocytic tumor) - have the potential for microinvasion.〔 *Hyalinizing trabecular adenoma Papillary adenomas are very rare.〔(emedicine > Thyroid, Evaluation of Solitary Thyroid Nodule > Benign Thyroid Nodules ) By Daniel J Kelley and Arlen D Meyers. Updated: Oct 17, 2008〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thyroid adenoma」の詳細全文を読む スポンサード リンク
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