adenomatoid nodule

adenomatoid nodule (thyroid)

One or more circumscribed but unencapsulated clusters of follicular cells that are morphologically similar to the surrounding thyroid tissue, which may arise in a background of Hashimoto’s thyroiditis and be confused with a true adenoma.
References in periodicals archive ?
The most common differential diagnoses of encapsulated thyroid lesions are macrofollicular adenoma, adenomatoid nodule, follicular adenoma, follicular variant of papillary carcinoma and an encapsulated follicular carcinoma.
71%) had micro follicular adenomatoid nodule in background of thyroiditis while 4 (4.
Microfollicular adenomatoid nodule and follicular adenoma are the frequent thyroid gland lesions presenting with follicular pattern on routine histopathological examination.
6%) were of microfollicular adenomatoid nodule having background of thyroiditis, 17 (8.
5] The benign group included benign follicular nodules such as adenomatoid nodule and colloid nodule and different cases of thyroiditis whereas all malignant lesions without any overt follicular architecture were included in the malignant group.
II) Benign 0-3% Clinical follow-up Consistent with a benign follicular nodule (Includes adenomatoid nodule, colloid nodule etc.
Follicular carcinoma must be distinguished from follicular adenoma, adenomatoid nodules, the follicular variant of thyroid papillary carcinoma, medullary carcinoma, and other clear-cell tumors (parathyroid adenoma/carcinoma) or metastatic renal cell carcinoma.
Inconclusive FNAC results and diagnostic errors are unavoidable due to overlapping cytological features, particularly among hyperplastic adenomatoid nodules, follicular neoplasms, and follicular variants of papillary carcinoma.
Fortunately, the vast majority of these nodules are benign (adenomas and adenomatoid nodules of multinodular goiters); approximately 2% to 12% are found to represent malignancy upon further work-up.
Pathologically, these follicular lesions consist of follicular adenomas, carcinomas, and cellular adenomatoid nodules.
Metastatic deposits are identified at a higher frequency in abnormal glands--that is, those with adenomatoid nodules, thyroiditis, and follicular neoplasms.
Many neoplasms are considered in the differential diagnosis, but the principal ones are follicular adenoma, follicular carcinoma, and medullary carcinoma; nonneoplastic considerations are diffuse hyperplasia (Graves' disease) and adenomatoid nodules.