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Difference between revisions of "Follicular thyroid adenoma"
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'''Follicular thyroid adenoma''', abbreviated ''FTA'', is a benign lesion of the [[thyroid gland]]. | |||
==General== | |||
*Most common neoplasm of thyroid.<ref name=Ref_EP51>{{Ref EP|51}}</ref> | |||
*Encapusled lesion (surrounded by fibrous capsule). | |||
==Gross== | |||
*Thick capsule. | |||
Notes: | |||
*The entire capsule should be submitted.<ref>SR. 17 January 2011.</ref> | |||
**A good start for most thyroid specimens with a thick capsule is 10 blocks. | |||
==Microsopic== | |||
Features: | |||
*Cellular. | |||
*Thick capsule - '''key feature'''. | |||
Negatives. | |||
*No invasion of the capsule - see ''[[follicular thyroid carcinoma]]''. | |||
*No nuclear features suggestive of [[papillary thyroid carcinoma]]. | |||
DDx: | |||
*[[Thyroid gland nodular hyperplasia]] with an encapsulated nodule - not as cellular. | |||
*[[Follicular thyroid carcinoma]]. | |||
==Sign out== | |||
<pre> | |||
LEFT THYROID, SUPERIOR POLE, EXCISION: | |||
- FOLLICULAR ADENOMA, MAXIMAL DIMENSION 5 MM. | |||
- LYMPHOCYTIC THYROIDITIS. | |||
- NODULAR HYPERPLASIA. | |||
- NEGATIVE FOR MALIGNANCY. | |||
</pre> | |||
===Micro=== | |||
The section shows a well-circumscribed lesion encapsulated by a thick fibrous capsule (~0.4 mm thick). | |||
The lesions consists of microfollicles with a dense appearing colloid. The nuclei have round regular nuclear membranes. Small indistinct nucleoli are seen at high power. | |||
Focally, the lesional cells overlap. However, the chromatin is not cleared. Nuclear grooves are not readily apparent and nuclear pseudoinclusions are not readily identified. | |||
==See also== | |||
*[[Thyroid gland]]. | |||
==References== | |||
{{Reflist|1}} | |||
[[Category:Diagnosis]] | [[Category:Diagnosis]] | ||
[[Category:Thyroid gland]] | |||