@entity6732 ( @entity6732 ) is a rare @entity5 or adjacent neck soft tissues, whose histogenesis is still debated. It may resemble other primary or metastatic poorly differentiated @entity5 histologically and the differential diagnosis is crucial for @entity6732 has a better prognosis. However, @entity6732 as a second @entity5 has not been reported in the literature. We report three cases of thyroid @entity6732 , including a unique @entity5 following breast-conserving surgery for early-stage @entity0 . There were two female and one male. All three @entity5 were located in the right lobe of the thyroid, and one @entity5 showed extension into the surrounding soft tissue. Histologically, all @entity5 showed expansive growth and consisted of cords, nests or sheets of epithelial cells divided into irregularly shaped lobules by fibrous connective tissue with lymphoplasmacytic infiltration. Focal squamous differentiation resembling Hassall's corpuscles were observed. All cases stained positively for @entity5893 , @entity2467 , high molecular weight cytokeratin, cytokeratin, @entity4206 , carcinoembryonic antigen and epithelial membrane antigen. Positive staining for @entity588 in two cases and @entity3507 in one case was noted. Ki-67 expression ranged from 15 to 25  %. Thyroid transcription factor and CD3 were negative. There was no evidence of recurrent or metastatic disease at following surgery. These features demonstrated @entity6732 may arise from branchial pouch remnants, the thyroid solid cell nests. @entity6732 is a rare entity, awareness of its occurrence as a second @entity5 is important to avoid overtreatment because it is associated with a favorable prognosis.

Carcinoma Showing Thymus-Like Elements of the Thyroid Gland: Report of Three Cases Including One Case with XXXX History.

@entity0 :: ('MESH:D001943', 'Disease') :: ['breast invasive carcinoma'] @entity588 :: ('596', 'Gene') :: ['Bcl-2'] @entity3507 :: ('1113', 'Gene') :: ['chromogranin A'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'malignant tumor of the thyroid', 'primary tumor', 'tumors'] @entity4206 :: ('8626', 'Gene') :: ['P63'] @entity5893 :: ('921', 'Gene') :: ['CD5'] @entity6732 :: ('MESH:D013953', 'Disease') :: ['Carcinoma showing thymus-like elements', 'CASTLE'] @entity2467 :: ('3815', 'Gene') :: ['CD117']
@entity0 :: (MESH:D001943,Disease) :: ['Breast Cancer']
